- Acid, carbonic, what it is, 509
- Aerial, on ship, (illus.), 455
- Aeroplanes, English Channel crossing (illus.), 132
- Curtiss biplane (illus.), 131
- first demonstrations of, 130
- first flight in Europe, 129
- first man-carrying (illus.), 128
- first successful (illus.), 126
- gas motors used in, 130
- gliding, 137
- greatest present value of, 136
- records of, 131
- red wing (illus.), 131
- what two brothers accomplished for, 130
- Wright Bros.’ inventions, 130
- Age, why do we, 196
- Air, does it move with the earth? 400
- does it weigh anything? 398
- dust in, 38
- extend, how far does, 243
- Airlocks, description of in tunnel building, 213
- Ammunition, first invention of, 40
- fixed, 47
- in prehistoric times, 40
- Animals, can they think? 194
- is man an, 180
- that leap greatest distance, 122
- which foretell weather, 240
- Anthracite seams (illus.), 260
- Aqueduct (illus.), 505
- Are matches poisonous, 294
- Armor, in the Middle Ages, 44
- Army, wireless in the, 448-451
- Are there two sides to the rainbow? 254
- Arrow, what causes it to fly? 408
- At what point does water boil? 220
- At what rate does thought travel? 242
- Australian Ballot, where first used, 122
- Automobile (illus.), axle, location of, 186
- beginning of, 183
- carburetor, location of, 184
- carburetor, use of, 184
- chassis, complete, 188
- cog-wheels, use of, 183
- cog-wheels, location of (illus.), 183
- crankcase, location of (illus.), 183
- cylinder, location of (illus.), 184
- drive shaft, location of (illus.), 187
- electric generator, use of, 185
- exhaust, 184
- fenders, location of, 188
- fenders, use of, 188
- finished car (illus.), 189
- first American (illus.), 189
- fly-wheel, location of (illus.), 183
- fly-wheel, use of, 183
- frame (illus.), 186
- gasoline, what it does, 183
- gasoline tank, location of, 187
- gears, location of (illus.), 183
- gears, use of, 183
- heart of (illus.), 184
- how improved, 190
- magneto, location of, 185
- magneto, use of, 185
- marvellous growth of twenty years, 189
- modern power plant complete, 190
- oil pan, use of, 184
- oil pump, location of, 184
- piston, location of (illus.), 183
- piston, use of, 183
- power plant, an (illus.), 185
- radiator, location of (illus.), 188
- radiator, use of, 188
- ready for the wheels, 187
- second stage of construction (illus.), 186
- self-starter, location of, 185
- self starter, use of, 185
- Smithsonian exhibit of complete power plant, 190
- springs, location of (illus.), 186
- springs, use of, 186
- steering gear, location of (illus.), 187
- street scene 20 years ago, 189
- transmission, location of, 186
- tire pump, use of, 185
- tires, how made, 382
- transmission, use of, 186
- water pump, location of, 185
- water pump, use of, 185
- what the completed chassis looks like (illus.), 188
- Bacon, Roger, discoverer of gunpowder, 44
- Balance, effect of sunlight on, 37
- Baldness, chief course of, 143
- why some people are, 143
- Ball, why it bounces, 63
- bearings, what they are, 180
- Balloon, what keeps it up, 199
- why it goes up, 199
- Ballot, when first used, 122
- Australian, where first used, 122
- Bearings, Ball, what they are, 180
- Bee, how it lives, 336
- why it has a sting, 336
- Bell, Alexander Graham (illus.), 70
- first telephone, 72
- Bend, why things, 62
- Biplanes, Curtiss (illus.), 131
- in flight, Curtiss (illus.), 136
- Birds, how do they find the old home? 408
- how they learn to fly, 178
- how they find their way, 407
- reproduction of life in, 179
- why do they sing? 408
- Birds’ Eggs, why different colors, 233
- Blasting gelatin, definition of, 206
- Bleriot, M., first European flights, 129
- Blotter, capillary attraction of, 18
- how it takes up ink, 18
- Blush, why do we, 194
- Boat, how it can sail under water, 269
- hydroplane of submarine, 270
- inside of a submarine (illus.), 272
- Bodies, swiftest moving, 25
- Boiling point of water, 220
- what makes water, 220
- Boring mill (illus.), 56
- Bottles, gurgle in, 63
- Bounce, why a ball will, 63
- Bow, long (illus.), 42
- Bow-and-Arrow, invention of, 43
- Boxes, match, how made, 294
- Brazil, Emperor of, receives first words over telephone, 74
- Bread, how flour is made, 462
- difference in Graham and whole wheat, 461
- grinding wheat (illus.), 464
- harvesting wheat, 460
- loaves of world (illus.), 459
- origin and meaning of, 460
- purifying machine (illus.), 463
- separating fibre germs (illus.), 463
- wheat conditioning (illus.), 462
- when wheat was first used in making, 461
- where it comes from, 460
- why so important, 460
- Break, why things, 62
- Breech, of a big gun, 53
- Breech-loaders in Civil War, 48
- in rifle, 47
- Brush, in writing, invention of, 13
- in writing (illus.), 13
- Bullets, cupro-nickel used in, 50
- grading of, 51
- weighing of (illus.), 49
- Buildings, concrete, how made (illus.), 100
- Buttons, on sleeves, 64
- Building, tallest in the world (illus.), 395-508
- what holds it up? 496
- Building foundations, construction of, 496
- compressed air, use of (illus.), 500
- cutting piles with a hot flame (illus.), 498
- driving steel piles, 496
- piles filled with concrete (illus.), 499
- piles, length of, 497
- piles, sinking of (illus.), 497
- use of oxyacetylene, 498
- Cable, laying armoring machine (illus.), 437
- arrived on other side, 433
- bulge (illus.), 437
- gear-paying-out (illus.), 431
- Great Eastern, the, 434, 437
- landing of (illus.), 433
- machinery on cable ship (illus.), 431
- paying-out machine (illus.), 431
- shore end of (illus.), 429
- storing of, aboard ship (illus.), 430
- what they look like when cut in two (illus.), 428
- Cable, ocean, Continental Morse Code, 438
- how dropped (illus.), 432
- how repaired (illus.), 435
- inventor of, 434
- laid, how, 429
- man who made it possible, 434
- pioneers of, 434
- signals as received (illus.), 438
- what is it made of, 429
- Cable, repairing, grapnels (illus.), 435
- how repaired, 435
- on rocky shore, (illus.), 438
- powerful engines used (illus.), 436
- splicing of (illus.), 436
- Cable, service, map of Trans-Atlantic, 439
- Cable, vault, of telephone (illus.), 67
- Cabriolet, 122
- Cacao, beans, bags of (illus.), 388
- how cured, 392
- nibs, 392
- Cacao, flaked, how made, 392
- how gathered, 391
- pods, how gathered, 391
- free, discovery of, 388
- and chocolate, difference between, 389
- Cackling, why a hen, 233
- Calibre of a gun, 53
- Calico, name, where from, 123
- Camera, 22
- first moving picture, 375
- Can a bee sting? 536
- Can animals think? 194
- Candles, did they come before lamps? 294
- why it burns, 21
- why it gives light, 21
- why you can blow out, 21-36
- when introduced, 296
- Candy, why do children like? 409
- why does eating candy make some people fat? 409
- Carbon, 352
- Carbonate of Soda, used in developing, 23
- Carburetor, in gas engine, 184
- Carpets, carding machine (illus.), 170
- dyeing the yarn, (illus.), 170
- examining and repairing (illus.), 173
- how yarn is dyed, 170
- manufacture of (illus.), 169
- modern, how made, 169
- packing for shipment (illus.), 173
- processes, 169-170-171, 173
- stamping designs, 173
- view of factory (illus.), 172
- weaving, by machine (illus.), 171
- wool, packing machine (illus.), 169
- wool sorting, 170
- Cartridges, invention of, 48
- types of (illus.), 49
- Cave, man who invented ammunition, 40
- Cement, alumina in, 95
- amount used in United States, 95
- arch, 95
- bagging (illus.), 99
- bridges, 95
- bucket (illus.), 97
- burned (illus.), 98
- calcined (illus.), 98
- clay in, 95
- crusher (illus.), 97
- dams, 95
- fireproof, 95
- grinders (illus.), 98
- industry, 95
- in water, 95
- kiln (illus.), 98
- lime in, 95
- machine (illus.), 97
- marl in, 95
- mill (illus.), 96-98
- mixing (illus.), 99
- mortar, 99
- on farms, 95
- origin, 95
- plastic, 95
- Portland, 95
- powder (illus.), 98
- quarry (illus.), 96
- reinforced, 95
- rock (illus.), 95-97
- sewers, 95
- shale in, 95
- shovel (illus.), 96
- sidewalks, 95
- silica in, 95
- strength of, 95
- subways, 95
- tunnels, 95
- walls, 95
- what is it, 95
- what made of, 95
- what used for, 95
- weighing (illus.), 99
- where obtained (illus.), 97
- Chalk, where it comes from, 18
- Chattering, why do my teeth, 218
- China-making, blungers, 404
- clay, in making dishes, 405
- decorating cups (illus.), 404-406
- dishes, how shaped, 405
- glazing plates (illus.), 404
- grinders (illus.), 404
- how the dishes are shaped, 405
- molding (illus.), 405
- pressing water from clay (illus.), 405
- pulverizing materials, 404
- pulverizing mill (illus.), 404
- saggers (illus.), 406
- taking the dishes from kiln (illus.), 406
- Chinese, probable discovers of gun powder, 44
- Chocolate, broma, what it is, 390
- cacao beans (illus.), 388
- cacao pods, (illus.), 391
- cacao tree, discovery of, 388
- cocoa butter, 390
- cocoa mill (illus.), 390
- cocoa roaster (illus.), 390
- cocoa shells, 390
- cracking mill, 389
- cream mixing (illus.), 393
- difference between and cacao, 394
- dipping department, 394
- finisher (illus.), 392
- flaked cocoa, 392
- heating machine (illus.), 393
- how are chocolate candies made? 394
- how made, 392
- making, 393
- milk, how made, 394
- mill (illus.), 392
- mixer (illus.), 393
- shell separator (illus.), 389
- what cocoa butter is, 390
- wrapping individual, 394
- Cigars, how they are made, 517
- Clay, what is, 495
- Circles, tendency to walk in, 91
- Clinking glasses, how it originated? 232
- Clock, age of, 319
- largest in the world (illus.), 321
- machinery which runs a big (illus.), 322
- in Independence Hall (illus.), 323
- in New York City Hall, 323
- Cloth, beaming (illus.), 89
- Burling (illus.), 88
- Burr picker, 87
- chloride of aluminum in making, 98
- English cap spinning (illus.), 89
- finished, ready for market (illus.), 90
- finish perching (illus.), 90
- fulling (illus.), 90
- how made from wool, 85
- how made perfect, 83
- how woolen is dyed, 87
- mending perching (illus.), 88
- napping, 89
- piece dyeing (illus.), 90
- ring twisting (illus.), 89
- sulphuric acid solution in making, 87
- teasel, 89
- weaving and scouring (illus.), 88
- web, 86
- woolen mule spinning (illus.), 89
- worsted carding (illus.), 85
- yarn inspecting (illus.), 89
- Clothes, cost of wool in a suit of, 83
- of wool, 80
- wool in one suit of, 83
- Coal, anthracite, 257, 258
- anthracite seams (illus.), 260
- breaker (illus.), 257
- cars ready to go to surface (illus.), 260
- dangers to the miners, 262
- electric cap lamp (illus.), 264
- firedamp, 262
- gas illuminating from, 299
- gases, 262
- history of the safety lamp (illus.), 263
- how the miners loosen the coal (illus.), 261
- how the slate pickers work (illus.), 259
- lamp which saves many lives, 263
- man who invented the safety lamp, 264
- mine workers that never see day light, 258
- mules and their drivers (illus.), 258
- peat, 262
- safety lamp and firedamp, 262
- seams (illus.), 260
- shaft gate (illus.), 260
- slate pickers (illus.), 259
- soft, 259
- spiral slate pickers (illus.), 259
- stable underground (illus.), 258
- undercutting with compressed air machines (illus.), 261
- undercutting with pick (illus.), 261
- Cocoa, see Cacao
- Cocoon, description of, 115
- completed (illus.), 116
- from which moths have emerged (illus.), 117
- how silk is reeled from, 118
- moths emerging from (illus.), 117
- number required to one pound of silk, 117
- silkworm beginning of (illus.), 116
- silkworm, preparing for making of (illus.), 116
- Coins, gold, 266
- in glass of water, 38
- silver, 266
- Cohesion, definition of, 219, 220
- Cold, why some things are, 144
- Color, exposed to light rays, 36
- in paint, 229
- what it is, 123
- Colors, different in birds’ eggs, 233
- in sunset, cause of, 253
- Color, of rainbow, 253
- red, why it makes a bull angry, 490
- Columbus, brought first sheep to America, 80
- Comb honey, development of (illus.), 529
- Compounds, compared with elements, 349
- Compressed air, method in building tunnels, 211
- Concrete, buildings (illus.), 100
- construction (illus.), 100
- decay, 101
- engineering, 102
- forms (illus.), 100
- houses (illus.), 101
- loads (illus.), 100
- mold, 101
- ornamental (illus.), 100
- practical uses of (illus.), 100
- rusting, 100
- Silo (illus.), 102
- stable (illus.), 102
- sun dial (illus.), 101
- tensile strain, 104
- tower (illus.), 102
- walls (illus.), 100
- water tower (illus.), 102
- what it is, 95
- wood, 102
- Confucius, philosophy written with brush, 13
- Cooking, when first used, 308
- Copper, as a conductor of electricity, 267
- wire, telegraph, 266
- Corn plant, how pollen fertilizes, 170
- why it has silk, 176
- Corn Silk, what it is for, 176
- baling presses (illus.), 476
- Cotton, drawing frames (illus.), 472
- slashers (illus.), 475
- spinning frames (illus.), 473
- warping machine (illus.), 474
- what nation produces the most, 477
- how much cloth will a pound of cotton make, 477
- mill (illus.), 471
- cloth, first steps in making, 472
- putting fiber on bobbins (illus.), 473
- cloth finished (illus.), 476
- who discovered, 477
- weave room, 475
- where it comes from, 470
- lapper machines, 471
- card room (illus.), 472
- bobbins (illus.), 473
- dye-house (illus.), 474
- beaming frames (illus.), 475
- inspecting tables (illus.), 476
- field a southern (illus.), 470
- breaker machines (illus.), 471
- slubber machines (illus.), 472
- speeders (illus.), 473
- spooling machine (illus.), 474
- shipping (illus.), 476
- what used for, 477
- cloths, what are the principle, 477
- Counting, man, himself, 19
- in tens, 19
- in twelves, 20
- Crying, what makes us, 195
- when hurt, why we, 93
- Cross-bow, invention of, 44
- Crude rubber, how treated, 378
- Culverins, early type of, 45
- Cylinder in gas engine (illus.), 184
- Darkness, cats can see in, 91
- some animals can see in, 91
- why we cannot see in, 91
- why we fear, 352
- Deep sea diving, the telephone adjusting (illus.), 202
- coming up (illus.), 204
- cost of outfit, 203
- helmet, putting on (illus.), 202
- just before going down (illus.), 204
- outfit, 202
- shoes, putting on (illus.), 202
- suit, putting on (illus.), 202
- telephoning from bottom, 203
- telephone, testing the (illus.), 203
- testing, final (illus.), 203
- water pressure at varying depths, 203
- wealth recovered by diving, 204
- weight of outfit, 203
- Deer-stalking with the cross-bow (illus.), 42
- Detonators, in firearms, 47
- Developer, Pyro, in photography, 23
- Diamonds, what made of, 351
- Did candles come before lamps? 294
- Die, why do we have to, 245
- Difference in woolens and worsteds, 84
- Dimples, what causes, 352
- Discovery of gunpowder, 44
- Discovery of stringed musical instruments, 479
- telephone, 71
- Diver’s task made easy (illus.), 284
- Diving, deep-sea, the telephone adjusting, (illus.), 202
- cost of outfit, 203
- hats of divers, 204
- just before going down (illus.), 204
- helmet, putting on (illus.), 202
- shoes, putting on (illus.), 202
- suit, putting on the (illus.), 202
- suit, what consists of, 202
- telephone from bottom, 203
- telephoning, testing the (illus.), 203
- testing final (illus.), 203
- water pressure at varying depths, 203
- wealth recovered by diving, 204
- weight of outfit, 203
- Dixie, what name means, 124
- where name originated, 123
- Does air weigh anything, 398
- Does the air surrounding the earth move with it? 400
- Does thunder sour milk, 196
- Does light weigh anything? 37
- Does the sun revolve on its axis? 511
- Do father and mother plants always live together? 176
- Do the ends of the rainbow rest on land? 254
- Do the stars really shoot down? 255
- Dog, why he turns round before lying down, 229
- Dolls, why girls like, 368
- Dom Pedro, Emperor of Brazil, who saved the telephone, 73
- Do plants breathe? 241
- Draft, created by chimney, 37
- Dreams, cause of, 366
- nightmare, 367
- what makes us? 366
- Drinking, origin of clinking glasses, 232
- Driving shield, airlock bulkhead (illus.), 210
- erector (illus.), 210
- in tunnel building (illus.), 208
- inventor of, 209
- tunnels, front view (illus.), 209
- Ducks, why water runs off backs of, 233
- Dust, in air, 38
- what it is, 104
- Dyeing, silk, 121
- Earache, what causes, 410
- Earth, how big it is, 124
- light surrounding, 38
- Echo, what makes an, 200
- whispering gallery, 201
- Eggs, birds why different colors, 233
- silkworm, how imported, 111
- Egyptians, how ancients wrote, 12
- Electric arc, temperature of, 35
- Electric current, what it is, 334
- Electricity, conductors of, 331
- current, 334
- good conductors, 331
- how discovered, 333
- non-conductors, 331
- what is, 329
- Electric lighting, arc-light, 307
- Edison’s first lamp (illus.), 306
- incandescent carbon lamp (illus.), 306
- Mazda lamp (illus.), 306
- tantalum lamp (illus.), 306
- Tungsten metal lamps, 305
- when introduced, 305
- Elements, carbon, 352
- compared with compounds, 349
- hydrogen, 349
- nitrogen, 350
- oxygen, 349
- what an is, 349
- Elevator, description of (illus.), 397
- installation (illus.), 396
- principal parts of, 396
- why does not the car fall? 397
- Emperor, saved the telephone, 73
- Emperor of Brazil, receives first message over first telephone, 74
- Engine, gas (illus.), 181-182
- carburetor, 184
- cylinder (illus.), 184
- horse-power, of, 256
- Exchange, first telephone, 75
- Exhibition, of first telephone at Centennial, 74
- Experiments, with mirror resultant in photograph, 22
- Exploding, a submarine mine, 34
- Explosions, how they break windows, 62
- in gas engines (illus.), 182
- of submarine mines (illus.), 34
- what happens in, 205
- Explosives, definition of, 205
- blasting gelatin, 206
- gun-cotton, 206
- nitroglycerine, 206
- Eye, of a submarine (illus.), 274
- Eyes, closed, walking with, 91
- hand quicker than, 376
- help brain in walking, 91
- in some pictures follow you, why, 36
- keeping body balanced, 91
- nature’s way of protecting, 38
- protecting with tears, 38
- sparkle when merry, why, 92
- why we can’t sleep when open, 92
- why we see stars when hit on, 268
- Eye-wash, tears as an, 38
- Fabrics, worsted, 85
- Fahrenheit, what is meant by, 221
- why so called, 221
- Fastest camera in the world, 25
- Fathers and Mothers, do plants have, 175
- Federal Government, grazing fee paid to, 82
- Fertilization, in birds, 179
- how corn plant fertilizes, 176
- of fishes, 177
- Fight, of Merrimac and Monitor, 32
- Film, before and after snapshot, 23
- sensitive, 23
- Finger prints, arch, (illus.), 520
- composite (illus.), 521
- of different people, 521
- enlargements of, 524
- how they identify us, 520
- impressions of orang-outang (illus.), 522
- loop (illus.), 520
- palmary impressions (illus.), 522
- specimen form of, record (illus.), 525
- spike that caught a criminal (illus.), 524
- thieves caught through their, 523
- thumb imprint on bottle (illus.), 523
- thumb impression on cash box (illus.), 523
- thumb mark on a candle (illus.), 523
- where first used, 522
- whorl (illus.), 521
- Fingers, why they hurt when cut, 143
- why we have ten, 142
- Finger nails, why we have, 142
- Fire, alarms when first used, 308
- first apparatus to fight, 308
- first fire department, 308
- first real, fire engine, 308
- gases put out, 37
- how man discovered, 289
- how man learned to fight, 208
- how man learned to make a, 289
- mark, of civilization, 290
- why it goes out, 37
- why is it hot? 401
- why put out by water, 222
- Fire making, drilling (illus.), 289
- drilling with bow string (illus.), 290
- drilling, two persons (illus.), 290
- first matches (illus.), 292
- flint and pyrites (illus.), 290
- flint, introduction of (illus.), 291
- plowing (illus.), 290
- pyrites (illus.), 290
- rubbing sticks together, 42
- sawing (illus.), 289
- steel and flint (illus.), 291
- tinder box (illus.), 291
- tinder box, pistol (illus.), 291
- with matches, 292
- Firedamp, 262
- explosion in safety lamp, 262
- Firearms, first crude efforts of, 45
- first real (illus.), 45
- fuse of, 45
- in early Chinese history, 44
- first trigger of, 45
- Firing, mortar, causes gas-rings, 27
- First man-carrying aeroplane, 128
- real telegraph, 421
- stringed musical instrument, 480
- telephone (illus.), 72
- telephone line, 72
- telephone switchboard (illus.), 74
- Fishes, how they are born, 177
- how they come to life, 177
- motion in swimming, 233
- what the eggs are, 177
- why they cannot live in air, 232
- Flag, made, how was American, 310
- made, when was American? 310
- Flash pan, early type, 45
- Flaxseed oil, what it is, 227
- Flight, of projectile, long, 30
- Flint-lock, invented in seventeenth century, 46
- invented by thieves, 46
- still in use in Orient, 46
- Floor, sounds through a, 79
- Flour, bolters (illus.), 465
- how made, 462
- purifying machine (illus.), 463
- sieves, 465
- Flowers, why they have smells, 176
- Flying, how birds learn, 178
- boat, wonderful (illus.), 133
- first Langley monoplane, 126
- first successful aeroplane (illus.), 126
- machine, first models, 127
- some of the men who helped, 126
- ten years of (illus.), 137
- Flying boat, fun in (illus.), 135
- gliding by, 137
- Flying boat, interior arrangement (illus.), 134
- monoplane type (illus.), 135
- six-passenger hull (illus.), 134
- speed of (illus.), 135
- the wonderful, 133
- views of (illus.), 133
- Flying machines, 126
- Bleriot flew in Europe (illus.), 129
- Curtis biplane in flight (illus.), 136
- Dr. Langley’s flying (illus.), 127
- early types of, 127
- first demonstrations, 130
- first flight in Europe with, 129
- first man-carrying aeroplane, 128
- first models, 127
- flying boat, 133
- flying boat, exterior arrangement, 134
- gliding experiments, 137
- government interest in, 138
- hull of flying boat, 134
- interesting governments in, 138
- Wright Bros., first flights, 130
- Focus, in eye, 22
- Fog, what it is, 105
- Food, how we learned to cook, 308
- Foreign monoplanes, some famous (illus.), 132
- Forsythe, LL.D. J., inventor of the primer, 47
- Freckles, what makes them come, 125
- Fuse, for firearms in early history, 45
- Funditor, 42
- Gas, acetylene, 305
- definition, 348
- first structure to be lighted by, 302
- in coal mines, 262
- water, 305
- Gas, illuminating, Baltimore first city to use, 302
- carbon in, 302
- discovered, when, 302
- first American house to use, 302
- first practical demonstration of, 302
- generator house (illus.), 299
- holder (illus.), 298
- how it gets into jet, 302
- how it is purified, 303
- how made, 303
- how the meter works, 304
- hydrogen in, 302
- impurities removed from (illus.), 301
- jet, the story in a, 303
- made of, 302
- meter, description, 304
- purifying boxes (illus.), 301
- removing tar from, 300
- shaving scrubbers (illus.), 300
- Gasoline engine (illus.), 181, 182
- Gases, generated at gun muzzle, 27
- how expelled in gun ingot, 55
- hydrogen, 349
- nitrogen, 350
- oxygen, 349
- tendency to put out fire, 37
- Gas-rings, in firing motor, 27
- Gatling, inventor of guns, 310
- Gelatine, in photography, 23
- Gestures, talking by, 18
- Ghosts, what are they? 367
- Glad, why do we laugh when, 92
- Glass, why it cracks, 63
- how long known, 247
- Glass, plate, casting (illus.), 249
- commercial, 246
- plate and window glass compared (illus.), 252
- Glass, plate, making, annealing, oven, 249
- beveling, 247
- blanketing, 252
- clay mixing (illus.), 248
- clay trampling (illus.), 248
- clay used, 247
- grinding table, 250
- materials used in, 247
- mercury, 253
- nitrate of silver, 253
- pots (illus.), 248
- pots, drying of, 248
- pots, length of usefulness, 248
- silvering, 247
- skimming the pot (illus.), 249
- treading, 247
- Glow-worm, why does it glow? 231
- Gold, why is it called precious? 266
- Gong, why does it stop when it has been sounded, 78
- Good luck, why a horseshoe brings? 311
- Graphite in lead pencils, 468
- Gravitation, what is, 267
- Gravity, center of, in gun, 61
- Gravity, force of, 61
- Greek fire, in early history, 44
- Growing, why do we stop, 195
- Gun, action at muzzle, 27
- annealing a gun ingot, 57
- assembling of, 48-54
- arquebus of, 1537, 47
- barrels, erosion of, 35
- blow-holes, 56
- bore searcher, 59
- breech of a, 53
- discharges, force of, 33
- calibre of a, 53
- elastic limit, 58
- elongation, 58
- forging a (illus.), 52
- heat treatment, 58
- hoops of a, 54
- improvements in, 45
- ingot, calibre of, 55
- jacket of, 54
- length of a, 53
- liner of, 54
- life of, 35
- manufacture in America, 48
- measuring inside diameter (illus.), 59
- modern built-up (illus.), 54
- mold for ingot, 55
- muzzle of, 53
- pressure generated in a big gun, 54
- photography (illus.), 33
- piping, 56
- powder chamber of a, 53
- rifling (illus.), 60
- rifling of, 53
- shrinking pit, 59
- tensile strength of, 58
- factory, testing materials, (illus.), 50
- tube of, 54
- tube, how it is tempered, 57
- why called gatling, 310
- wire-wound, 54
- Gun-barrels, imported from England, 49
- resisting pressure of, 34
- Gun-cotton, in smokeless powder, 35, 206
- Gunpowder, Chinese probable discovers of, 44
- discoverer of, 44
- experiments by Schwartz, 45
- formula of Roger Bacon, 45
- ingredients in, 205
- manufactured in monasteries, 44
- what causes the smoke? 206
- smokeless, what made of, 206
- why some is fine and others large grained, 206
- Gurgle, in bottles, 63
- Hail, what causes, 124
- Hair, what causes baldness, 143
- why it don’t hurt when cut, 143
- why it keeps growing, 144
- Hand bombards, early types, 45
- Hands, shaking, why with the right, 231
- Hansom, why so called, 122
- Have plants fathers and mothers? 175
- Heart, why beats during sleep, 191
- why beats faster when scared, 191
- why beats faster when running, 191
- Heat, light wave changed into, 36
- why a nail gets hot when hammered, 230
- why some things are warm, 144
- how we obtain, 231
- Hemp, Manilla (illus.), 356
- Hobson’s choice, how originated, 311
- Honey, apiary in summer (illus.), 534
- how produced, 527
- worker comb (illus.), 532
- manner of using German bee-brush, 533
- finished product (illus.), 533
- frame (illus.), 535
- how to bump the bees off a comb (illus.), 533
- bee-hat (illus.), 535
- a study in cell-making (illus.), 532
- bee sting, can a, 536
- frame of bees (illus.), 535
- comb, how bees build, 536
- Honey-bee, poison-bag, 537
- egg of queen, under microscope (illus.), 529
- preparing for rearing, 531
- living on combs in open air, (illus.), 527
- the daily growth of larvæ (illus.), 532
- effect of a sting (illus.), 536
- worker-bee (illus.), 527
- what the queen-bee does? 528
- drone-comb (illus.), 532
- clipping queen bees wings (illus.), 533
- cucumber blossom with bee on it (illus.), 528
- queen-bee (illus.), 527
- the queen and her retinue (illus.), 529
- queen-rearing, 531
- queen-cells (illus.), 529
- Honeymoon, why do they call it a? 311
- Horizon, how far away is the, 245
- what is it, 244
- where is it, 244
- Horse-power, a, what it is, 256
- Horseshoes, why it is said to bring good luck? 311
- Hot box, cause of, 368
- Houiller, French gunsmith, 48
- Houses, concrete (illus.), 101
- How far does the air extend? 243
- is ammunition made (illus.)? 49
- does an arc light burn? 307
- are automobile tires made? 382
- does a honey bee live? 336
- does a bee make honey? 527
- do bees build the honey comb? 536
- does the honey bee defend itself? 536
- does honey develop in a comb (illus.)? 530
- do birds learn to fly? 178
- do birds find their way? 407
- does the blotter take up the ink of a blot? 18
- this book is bound, 578
- this book is made, 561
- the paper in this book is made, 561
- the pictures in this book are made, 581
- are bullets made? 51
- is an ocean cable laid? 429
- does a camera take a picture? 22
- is a cable dropped into the ocean (illus.)? 432
- are modern carpets made? 169
- is a carpet woven by machinery? 171
- is china decorated? 406
- is china made? 404
- is chocolate made? 392
- did the custom of clinking glasses in drinking originate? 232
- are cigars made? 517
- is cloth made from wool? 86
- did the coal get into the coal mines? 257
- does a coal mine look inside? 260
- do the cocoa beans grow (illus.)? 391
- is the color put on the outside of the pencil? 469
- is the honey comb made? 532
- are concrete roads built (illus.)? 103
- did man learn to cook his food? 308
- are concrete buildings made (illus.)? 100
- is woolen cloth dyed? 87
- big is the earth? 124
- much of the earth does the sun shine on at one time? 324
- does an elevator go up and down (illus.)? 396
- was electricity discovered? 333
- does the light get into the electric bulb? 305
- is the eraser put on a pencil? 469
- can an explosion break windows? 62
- explosions may occur on submarines, 278
- does the farmer use concrete (illus.)? 102
- do our finger prints identify us? 520
- did man learn to fight fire? 308
- did man learn to make a fire? 289
- are fishes born? 177
- was the flag made? 310
- is flour made? 462
- does a fly walk upside down? 454
- did men learn to fly? 126
- does the gas get into the gas jet? 302
- is illuminating gas made? 303
- is gas purified? 303
- is plate glass made? 246
- is plate glass ground? 250
- a wire-wound gun is made? 54
- was the first American gun made (illus.)? 47
- is a gun ingot made? 55
- do we find the length of a gun? 53
- is a gun tube tempered? 57
- do we obtain heat? 231
- the heel of a shoe is put on (illus.), 560
- did Hobson’s choice originate? 311
- far away is the horizon? 245
- does a key turn a lock (illus.)? 491
- does a spring lock work (illus.)? 492
- are lead pencils made? 467
- do the miners loosen the coal? 261
- is light produced, 230
- are magnets made? 335
- are matches made? 293
- are match boxes made? 294
- did man learn to send messages? 412
- does the meter measure the gas? 304
- can microbes spread through the body? 410
- are mirrors silvered? 522
- big is a molecule? 348
- did money originate? 455
- are moving pictures made? 369
- does the music get into the piano? 478-482
- did the word news originate? 312
- did a nod come to mean yes? 19
- did shaking the head come to mean no? 19
- are paints mixed? 228
- is a photograph developed? 23
- was the piano discovered? 479
- do plants breathe? 241
- do plants reproduce life? 175
- does the shield cut through the ground in tunnel building? 212
- are shooting shells photographed? 24
- shoes are made by machinery, 549
- shoe machinery was developed, 457
- is crude rubber secured? 377
- is rope turned and twisted? 358
- are rubber tires made? 378
- are modern rugs made? 169
- to splice a rope, 364
- do men go down to the bottom of the sea? 202
- did the sand get on the seashore? 108
- far back does the silkworm date? 109
- was silk introduced into Europe? 110
- are the silkworms cared for? 113
- do we know a thing is solid, liquid or gas? 348
- are sounds produced? 485
- fast does sound travel? 486
- can sound come through a thick wall? 79
- is the volume of sound measured? 242
- far does space reach? 256
- do the slate pickers work? 259
- does a captain steer his ship across the ocean? 407
- can a ship sail under water, 269
- is a submarine submerged? 270
- do sponges grow? 286
- do sponges eat? 287
- are sponges caught? 287
- are the stars counted? 241
- big is the sun? 141
- hot is the sun? 141
- is a steel pen made (illus.), 17
- did man learn to shoot, 40
- do we get wool off the sheep? 82
- is a stone thrown with a sling? 41
- are metallic and paper shells filled with powder? 50
- did man learn to talk? 18
- did the telephone come to be? 70
- fast does thought travel? 242
- does a telegram get there? 414
- did man learn to tell time? 313
- did man begin to measure time? 314
- did men tell time when the sun cast no shadows? 317
- is the time calculated at sea? 315
- is tobacco cultivated? 516
- is tobacco cured? 516
- was tobacco discovered? 512
- is tobacco harvested? 515
- is tobacco planted? 514
- is a tunnel dug under water? 208
- does water put fire out? 222
- is white lead made? 225
- are wires put under ground? 76
- did writing first come about? 11
- did the Chinese write? 13
- did the Monks do their writing? 14
- does a pen write? 18
- much does the wool in a suit of clothes cost? 83
- much wool does America produce? 82
- is wool taken from the sheep? 82
- is the yarn for carpets dyed? 170
- is oxide of zinc obtained? 226
- does the water get into the faucet? 501
- are the big water pipes laid? 504
- did the name Uncle Sam originate? 458
- Human body, wonders of the, 311
- Hunting, with the bow-and-arrow, 43
- Hurt, why we cry when, 93
- Hydrogen, what it is, 349
- Hypo, used in developing, 23
- Impact, of projectile from guns, 28
- Ink, how does a blotter take up? 18
- Instruments, artillery, testing, 24
- musical, 488
- optical, based on refraction, 38
- Incandescent lamp, development of, 306
- Inside of a mine planting submarine (illus.), 277
- Iron, cast, 265
- melts at, 35
- the most valuable metal, 265
- wrought, 265
- Is a moth attracted by a light? 288
- man an animal? 180
- the hand quicker than the eye? 376
- there a reason for everything? 200
- there a man in the moon? 400
- yawning infectious? 192
- Jacket, of a gun, 54
- Japan the natural home of the silk worm (illus.), 112
- Kentucky rifles, 45
- Key, how it works in a lock (illus.), 491
- Knots, different kinds of (illus.), 363
- what makes, in boards, 223
- Lambs, Siberian, in South Dakota (illus.), 80
- Lamps, first street light in America, 296
- the Clanny safety, 264
- did candles come before? 294
- earliest forms of, 295
- Edison’s first (illus.), 306
- incandescent carbon (illus.), 306
- incandescent, development of, 306
- incandescent, electric, when invented, 305
- French watch tower (illus.), 295
- Mazda (illus.), 306
- from Nushagak hanging (illus.), 297
- Pagan votive (illus.), 296
- Tantalum (illus.), 306
- street, when first used, 295
- chimney protects flame, 37
- coal miners and safety, 262
- Lamp chimney, why it makes a better light, 37
- Langley, Dr. Samuel P., 1914 flight of aeroplane, 128
- Languages, why so many, 197
- Lantern, the first oil (illus.), 297
- the “Réverbère” (illus.), 297
- Laugh, when glad, why we, 92
- nerves, 93
- when tickled, why we, 93
- Laughter, reflex action, 93
- Lead, as used in making paint, 267
- in a pencil, 468
- why so heavy, 267
- as used in pipes for plumbing, 267
- Leather, how the hides are treated, 539
- treatment of hides, 538
- unhairing machine (illus.), 540
- hide house (illus.), 538
- tanning process, 539
- rolling room (illus.), 539
- tanning sole leather, 539
- how upper leather is tanned (illus.), 540
- disposing of waste material, 540
- wringers, 539
- tan yard (illus.), 539
- Legs, not same length, 91
- Lens, in the eye, 22
- Leyden jar, what it is, 332
- Life, beginning of, 174
- beginning of man’s, 174
- how plants reproduce, 175
- Light, attracting moths, 288
- glow-worms why they glow? 231
- how produced, 230
- lightning bugs, made by, 231
- where it goes when it goes out, 36
- what makes match, 198
- in mirror, 22
- in negative, 23
- rays, 36, 495
- broken rays of, 38
- rays, heat from, 36
- and refraction, 38
- speed of, 36, 140
- travels faster than anything in the world, 36
- surrounding earth, 38
- wave changed into heat, 36
- Lighting, arc, how does it burn, 307
- in America, first street (illus.), 296
- first oil lantern, 297
- electric, when introduced, 305
- first street light in Paris, 297
- gas tank, (illus.), 298
- Lightning, why it follows thunder, 140
- Lightning bugs, why they produce light, 231
- Lignite, found in coal mines, 262
- Liner, of a gun, 54
- Linseed oil, extraction of, 228
- what it is, 227
- where it comes from, 227
- Liquid, definition, 348
- Living, why do some people live longer, 199
- reproduction necessary why, 174
- reproduction of, in birds, 179
- reproduction of, in fishes, 177
- Loading machines in powder factory, 50
- Lobsters, red, what makes them, 245
- Lock, cylinder (illus.), 492
- how a key turns a (illus.), 491
- how key changes are provided (illus.), 491
- how a spring lock works (illus.), 492
- master-keyed cylinder (illus.), 492
- what happens when the key is turned? (illus.), 491
- what happens when the knob is turned? (illus.), 491
- Locomotives, boiler of articulate type (illus.), 440
- boiler of (illus.), 442
- cab of (illus.), 442
- cylinders description of, 441
- low pressure cylinders of (illus.), 441
- electric, newest (illus.), 443
- one of the largest (illus.), 440
- signal tower, latest (illus.), 444
- stoker, automatic (illus.), 443
- water tank (illus.), 444
- Lodestone, what it is, 327
- “Long Bow,” in Sherwood Forest (illus.), 42
- Loom, cloth making machine, 86
- Magnet, breaking iron (illus.), 330
- electro (illus.), 326, 328, 335
- electric lift (illus.), 326
- experiments with, 327
- great lifting by (illus.), 330
- how made, 335
- what makes it lift things? 326
- wonders performed by, 326
- work it can do (illus.), 328
- Man, writing, how man learned, 11
- counting himself, 19
- is he an animal? 180
- Matches, are they poisonous? 294
- first, 292
- how made, 293
- lucifer (illus.), 292
- making by machinery, 293
- modern safety (illus.), 292
- oxymuriate (illus.), 292
- promethean (illus.), 292
- what we would do without, 292
- when first used (illus.), 292
- Match-lock, of early firearms, 45
- Melting of iron, 35
- Men who made the telephone, 70
- Mercury, fulminate of, 49
- Merrimac and Monitor, fight of, 32
- Merry, why eyes sparkle when, 92
- Messages, how men learned to send, 412
- Indian smoke signals, 412
- marathon runner by (illus.), 413
- pony telegraph (illus.), 413
- Messenger boy, how to call a (illus.), 414
- the first (illus.), 413
- Metal, what is a, 265
- what is the most valuable? 265
- why we use for coining, 456
- Meter, description of gas, 304
- how it measures gas, 304
- Milk, does thunder sour? 196
- Milky way, why is it called, 255
- what is, 255
- Mine cars (illus.), 260
- Mines, clearing channel of buoyant, 283
- exploding submarine, 34
- planting submarine, inside of (illus.), 277
- workers that never see daylight, 258
- Mirror, collects rays of light, 22
- reflection in, 22
- reflects rays of light, 22
- Mirrors, beveling (illus.), 251
- how made, 251
- how silvered, 252
- polishing, 251
- roughing, 251
- silvered with mercury, 253
- silvering mirror plates (illus.), 252
- Molecule, how big is a, 348
- what is a, 348
- Monasteries, where gunpowder was manufactured, 44
- Money, how originated, 455
- metallic forms of, 456
- who made the first cent, 458
- who originated, 455
- why do we need, 455
- why gold and silver are best for coining, 457
- Monitor and Merrimac, fight of, 32
- Monks, making gunpowder, 44
- Monoplane, flying boat (illus.), 135
- German (illus.), 132
- over Mediterranean (illus.), 132
- Moon, why it travels with us, 399
- the man in the, 400
- Morse, S. B., inventor of telegraph, 420
- Mortars (illus.), 26
- Mothers and Fathers, do plants have, 175
- Moths, attracted by light, 288
- emerging from cocoon (illus.), 117
- Motion bodies, swiftest, 25
- Motion, is train harder to stop than start? 223
- of light, 140
- of sound, 140
- perpetual, 61
- perpetual, in mechanics, 240
- Motors, gas, used in aeroplanes, 130
- Mountains, what made them, 401
- Moving pictures, Board of Censors, 373
- developing room (illus.), 372
- drying room (illus.), 373
- continuous movement of film, 376
- exact size of film, 370
- first camera, 375
- first exhibited at studio, 372
- how made, 369
- how freak pictures are made, 376
- negative, stock, 370
- negative, perforated, 370
- “Pigs is Pigs” (illus.), 374
- rehearsing (illus.), 371
- scenario (illus.), 374
- staging, 371
- taking a (illus.), 373
- Mulberry trees, food for silk worms (illus.), 112
- Mules and drivers (illus.), 258
- Multiple switchboard of telephone, 69
- Music, harp, 479
- lyre, 479
- note, what it is, 490
- what pitch is, 489
- what is, 478
- Musical talking machines, 490
- Muzzle, of a big gun, 53
- Muzzle-loaders, in Civil War, 47
- Nails, why they get hot when hammered, 230
- Names, of people, 20
- Nature, protecting eyes, ways of, 38
- Navigating on bottom of sea, 283
- Negative in photography, 23
- Nerves, sensory, receive impression, 93
- transmitting impression, 22
- News, how did the word originate? 312
- Nightmare, cause of, 367
- Nitrogen, what it is, 350
- Ocean, why is it blue? 219
- what makes it green? 219
- why don’t water sink in? 219
- where did all the water in, come from? 218
- where is water at low tide, 219
- Of what use is my hair? 143
- Of what use are pains and aches? 410
- Oil baths, for gun (illus.), 57
- Oil cake, from linseed, 228
- Oil, palm olive, in soap, 411
- Omniscope, of submarine boat, 271
- Onions, make tears, 38
- bad effect of on eyes, 38
- Operatives, in powder factory, girls as, 49
- Optical instruments, based on refraction, 38
- Organic matter, what it is, 174
- Origin of cement, 95
- of counting in tens, 19
- names of people, 20
- of nodding to indicate yes, 19
- of shaking head to indicate no, 19
- of turnpike, 104
- Oxide of zinc smelter (illus.), 227
- how obtained, 226
- Oxygen, what it is, 349
- in air, 37
- Pain, of what use is, 410
- what it is, 244
- Paint, care of, story in, 224
- how mixed, 228
- uses of, 224
- what used for, 224
- Paint manufacturing, colors, what makes different, 229
- buckles before corrosion (illus.), 225
- buckles after corrosion (illus.), 225
- buckles placed in stacks (illus.), 225
- buckles taken from stacks (illus.), 225
- first step in making (illus.), 224
- lead buckles making (illus.), 224
- lead, white, how made, 224-225
- lead white used in, 224
- grinding lead in oil (illus.), 228
- washing the lead (illus.), 226
- mixing, 228
- where paints are mixed (illus.), 228
- linseed oil, where obtained, 227
- pressing oil from flaxseed (illus.), 228
- removing oil cake from press, 228
- sulphur roasting furnace (illus.), 226
- zinc smelter (illus.), 227
- oxide of zinc, how made, 226
- Paper, earliest forms of, 14
- sensitive in photography, 23
- shells, inspection of (illus), 49
- papyrus, the first, 14
- Papyrus, invention of, 14
- Patents, of original telephone, 73
- Peat, as a fuel, 262
- Pen, first metallic (illus.), 15
- first steel (illus.), 15
- first metallic pen, how made, 15
- how it writes, 18
- invention of the, 15
- Pencils, “lead” where from, 466
- eraser is put on, 469
- making description of (illus.), 467
- who made the first? 466
- Periscope, description of, 275
- how we look through a (illus.), 276
- mirror of, 275
- Perpetual motion, nearest approach to, 240
- is it possible? 61
- Persian rug, antique (illus.), 167
- how made, 167
- imitation (illus.), 167
- Kurdistan (illus.), 167
- where best are made, 167
- Photographs, of projectiles, 25
- Photography, resultant from experiments with mirror, 22
- Piano, pitch, 489
- finishing (illus.), 484
- why not more than seven octaves, 480
- Dulcimer (illus.), 479
- spinet (illus.), 480-481
- note what it is, 490
- sounding board, 488
- tuning, (illus.), 484
- building case around (illus.), 483
- how the music gets into the, 482
- clavichord (illus.), 480
- instruments, musical, 488
- strings, fastening on (illus.), 482
- psaltery, 480
- sound box, the first, 479
- who made the first, 478
- hammers (illus.), 483
- action regulation (illus.), 484
- virginal (illus.), 480-481
- first (illus.), 478
- tuning fork, 488
- polishing (illus.), 484
- sounding board, putting on the (illus.), 482
- how discovered, 479
- lyre, 479
- octave, 480
- harpsichord (illus.), 480-481
- Pickers, boy, slate (illus.), 259
- Pictures, with a fast camera, 39
- moving, how made, 369
- size of moving film, 370
- never seen by the human eye, 31
- taken in one five-thousandth of a second, 31
- Pin money, why they call it? 231
- how name originated, 231
- Pistols, invented in Pistola, Italy, 46
- Plants, corn, why it has silk? 176
- do father and mother plants live together, 176
- how they eat, 511
- how they reproduce, 175
- why do flowers have smells? 176
- why they produce leaves, 175
- Plate glass, (illus.), 246
- Portland Cement, why called, 95
- Powder, filling shells, 50
- gun-cotton in smokeless, 35
- secret of smokeless powder, 35
- smokeless, 35
- in submarine mines, amount of, 34
- Pressure, generated in bore of a big gun, 54
- inside of a gun at discharge, 33
- in gun-barrel, resistance of, 34
- of light, on scales, 37
- Primer, invented by, 47
- Prof. Bell’s vibrating reed (illus.), 71
- Projectiles, photographs of, 25
- arrival at target, 24
- clear of smoke-zone (illus.), 30
- smoke-zone, emerging from (illus.), 29
- height in air from mortar, 30
- impact of, from guns, 28
- leaving gun muzzle (illus.), 27
- travel faster than sound, 32
- velocity of, 33
- viewed in transit, 33
- weight of, 53
- Proving grounds, for big guns, (illus.), 53
- Pyro, used in developing, 23
- Quarry, cement (illus.), 96
- Quill the, in writing (illus.), 14
- Quills, raising geese for, 14
- Rails, steel making, blast furnace (illus.), 234
- blooming mill (illus.), 237
- crane, carrying ingot, (illus.), 236
- length of, 238
- mixer (illus.), 234
- molten steel, pouring (illus.), 236
- open hearth furnace (illus.), 235
- pouring side of open hearth furnace, 235
- shrinkage of, 238
- soaking pit (illus.), 236
- temperature in furnace, 235
- Rain, where it goes, 222
- why it freshens the air, 222
- Rainbow, cause of, 253
- colors in, what makes? 254
- ends of, 254
- Rays, change their course, 38
- heat from light, 36
- of light, 36
- Roentgen, 307
- Rays-X, what are they? 307
- Reason, is there one for everything? 200
- Reed, the (illus.), 12
- Reflection, in mirror, 22, 91
- Refraction, changing light rays called, 38
- of light, 38
- Reproduction, of life, in birds, 179
- in fishes, 177
- in plants, 175
- why we must have, 174
- Rifle, Kentucky, 45
- kick of, 47
- modern automatic, 47
- over-loading, 47
- wheel-lock (illus.), 46
- Rifling, causes rotation of projectile, 32
- a big gun (illus.), 60
- of a gun, 53
- invented in Austria, 46
- Roads, concrete (illus.), 103
- Roentgen Rays, 307
- Rope, breaker (illus.), 360
- compound laying machine (illus.), 361
- cross-section, 362
- draw frame (illus.), 360
- drying fiber, 354
- Egyptian kitchen (illus.), 354
- Egyptians making (illus.), 353
- preparing the fiber in (illus.), 359
- four-strand (illus.), 362
- hackling, 354
- hemp (illus.), 356
- hemp in warehouse (illus.), 356
- knots, 363
- lengths, standard, 362
- oiling in manufacture, 356
- long made by hand, 354
- machine (illus.), 358
- opening bales of fiber (illus.), 359
- preparation room (illus.), 359
- scraping fiber (illus.), 354
- sliver formation of (illus.), 360
- spindles, 355
- spinning after turn, 355
- Rope spinning, after turn, 355
- foreturn, 355
- splicing (illus.), 364
- spreader (illus.), 360
- stakes, 355
- Rope walk, modern (illus.), 357-358
- old-fashioned (illus.), 355
- Routine, of a telephone call (illus.), 68
- Rubber, automobile tires, 382
- biscuit, 377
- blisters, 379
- blow holes, 379
- breaker-strip, 384
- calendering, 381
- castilloa, 387
- cement, 381
- crude, 377-378
- curing room, 382-383
- dryer, 379
- fabric, 384
- furnishing pneumatic tires (illus.), 386
- gathering (illus.), 377
- how secured, 377
- how are inner tubes made, 385
- marketing balls of, 377
- mixing, 379
- Para, 387
- pneumatic tires, 383
- pure, why not used, 380
- spreading, 381
- spreader room (illus.), 383
- tapping (illus.), 377
- tire building machines (illus.), 385
- tires, how made, 378-379-380
- tread laying room, 384
- tubes, inner, how made, 385
- vulcanizing, 384
- washing, 378
- wild, what is, 387
- why not used pure, 380
- wrapping room, 386
- Rugs, designs imitated by machinery, 168
- Persian (illus.), 167
- Persian, how made, 167
- Persian, imitation, 167
- Persian Kurdistan (illus.), 167
- Persian, where best are made, 167
- Tabriz, reproduction (illus.), 168
- weaving by machine (illus.), 171
- Rug manufacturing, carding machine (illus.), 170
- examining and repairing (illus.), 173
- packing for shipment (illus.), 173
- processes, 169-170
- weaving by machinery (illus.), 171
- wool sorting, 170
- Sadness, cause of tears, 38
- Salt, beds, 493
- chemical name of, 493
- in water, 351
- mines, 493
- Salt Lake, 493
- soda, 493
- supply for United States, 493
- wells, 493
- where it comes from, 493
- Scales, pressure of light on, 37
- School slates, where they come from, 495
- Score, origin of, 26
- Scouring, wool (illus.), 85
- Scouring and weaving, in making woolen cloth (illus.), 88
- Screens, in shot tower, 51
- Sea, diver, 202
- how men go down to the bottom of, 202
- navigating on bottom of, 283
- time calculated on the, 315
- what the bottom looks like, 202
- what makes it roar, 401
- Second, reckoning in millionths of a, 25
- pictures taken in one five-thousandth of a, 31
- Seeds, why plants produce, 175
- Seeing, why we cannot see in dark, 91
- Sensation, of sight, 22
- Sensitive, paper, 23
- Service, military, U. S., 24
- Shadows, cause of, 495
- Shell, sounds in a, 79
- Shells, filling with powder, 50
- inspection of metallic (illus.), 49
- putting metal heads on paper, 50
- wad-paper in making, 50
- Sheep, coming out of forest (illus.), 82
- first in America, 80
- fleece packing, 82
- how much wool does a sheep produce? 83
- how wool is taken from the, 82
- how taken care of, 82
- how we get wool off of, 82
- industry in America, 80
- industry in the colonies, 81
- industry in the west, 81
- number in the west, 81
- shearing, 82
- shearing machines, 82
- wool-producing, 83
- why sheep precede the plow in civilizing a country, 81
- Shield driving, air lock bulkhead (illus.), 210
- caulking the joints (illus.), 214
- description of airlocks, 213
- erector at work (illus.), 214
- erector (illus.), 210
- at end of journey (illus.), 216
- grommetting the bolts (illus.), 214
- grouting (illus.), 214
- how it cuts in tunnel building, 212
- how they meet exactly (illus.), 215
- in tunnel building (illus.), 208
- key plate (illus.), 214
- curves around (illus.), 216
- models of Penna. R.R. tunnel shields (illus.), 212
- rear end in tunnel building (illus.), 210
- tunnels, front view (illus.), 209
- Ship, how does a captain steer his, 407
- how can it sail under water? 269
- Shoes, Amazeen skiving machine, 550
- assembling machine (illus.), 552
- automatic heel loading and attaching machine (illus.), 560
- automatic leveling machine (illus.), 559
- automatic sewing machine, 555
- American made, 547
- ancient and modern forms of sandals, (illus.), 543
- ancient sandal maker (illus.), 541
- beginning of a shoe (illus.), 549
- boot developed from the sandal, 544
- boots (illus.), 546
- channel cementing machine (illus.), 558
- channel laying machine (illus.), 559
- channel opening machine (illus.), 558
- Crakrow or peaked (illus.), 544
- which church and law forbade (illus.), 544
- description of ancient sandal (illus.), 542
- dyeing out machine, 551
- different parts come together, 551
- duplex eyeletting machine, 550
- edge trimming machine (illus.), 560
- Ensign lacing machine, 551
- evolution cf the sandal to the shoe (illus.), 542
- first machine for making shoes, 545
- hand method lasting machine (illus.), 553
- heel breasting machine (illus.), 560
- heel trimming machine (illus.), 560
- ideal clicking machine, 550
- Inseam trimming machine (illus.), 556
- insole tacking, 551
- lasting machine (illus.), 553
- loose nailing machine (illus.), 559
- success of McKay machine, 547
- machine that forms and drives tacks, 554
- machines which punch the soles of, 559
- my lady’s slippers (illus.), 548
- placing shank and filling bottom, 556
- planet rounding machine, 551
- power tip press, 550
- pulling over machine (illus.), 552
- putting the ground cork and rubber cement in, 556
- rolling machine, 551
- rounding and channelling machine (illus.), 557
- sewing the sole on, 558
- slugging machine (illus.), 560
- sole laying machine (illus.), 557
- Summit splitting machine, 551
- upper stapling machine (illus.), 554
- upper trimming machine (illus.), 554
- welt and turned shoe machine (illus.), 555
- welt beating and washing machine, 556
- welt sewing machine, 551
- what was the first foot covering like? 541
- “whipping the cat,” 545
- who made the first shoe in America? 545
- work performed by heeling machine (illus.), 560
- Shooting tests (illus.), 48
- Shotguns, assembling of, (illus.), 48
- Shot pellets, 51
- Shrinking, pit for big gun, 59
- Shuttle, In weaving wool, 86
- Siberian lambs, in South Dakota (illus.), 80
- Signs, talking by, 18
- Silica, mine (illus.), 247
- Silk, 109
- called “bomby-kia,” 110
- caring for young worms, 113
- culture, 110
- drying skeins of, 119
- dyeing, 121
- first step in manufacture, 119
- first used, 109
- hatching eggs, 113
- introduction of into Europe (illus.), 110
- number of cocoons in pound of, 117
- manufacture of, 119
- method of reeling, 113
- moths depositing eggs (illus.), 112
- preparing cocooning beds, 112
- reeling silk from cocoon (illus.), 118
- spinning (illus.), 120
- thread made uniform (illus.), 120
- threads ready for the weaver, 121
- twisting (illus.), 120
- use of, 109
- water-stretcher (illus.), 121
- winding (illus.), 119
- Silk manufacture, doubling frames, 120
- spinning, 120
- twisting, 120
- Silk moth, description of 114
- Silkworm, age, 115
- first breeder of, 109
- chrysalis (illus.), 114
- cocoon, 115
- cocoon, beginning of (illus.), 116
- cocooning bed (illus.), 112
- description of, 114
- domestication of, 111
- eating (illus.), 115
- female moth (illus.), 114
- how cared for, 113
- how it eats, 115
- home of, 112
- eggs, how imported, 111
- hatching the eggs (illus.), 113
- how he does his work, 114
- larvæ of, (illus.), 114
- motions of head in spinning, 115
- molting season, 115
- moths emerging from cocoon (illus.), 117
- male moth (illus.), 114
- mulberry branches for (illus.), 112
- one of the world’s greatest wonders, 116
- preparing for making cocoon (illus.), 116
- reared, how they (illus.), 115
- shedding old skin, 115
- spinneret of the, 115
- spinning cocoon, 115
- wild, 109
- Silver, definition of, 207
- use, history of, 207
- why does it tarnish, 266
- Silver bromide, in photography, 23
- Skins, used for clothing, 80
- Sky, will it ever fall? 255
- why is it blue? 253
- Soap, lye in, 411
- palm olive oil in, 411
- what made of, 411
- Soda, Leblanc process, 494
- Solvay process, 494
- where we get, 494
- Solids, definition, 348
- Some wonders of the human body, 311
- Sound, deadening of, 79
- first over a wire, 71
- how measured, 242
- how produced, 485
- speed of, 140-486
- travels through air slowly, 31
- in a sea shell, 79
- what is, 78-485
- waves, 79
- waves, length of, 487
- where comes from, 78
- Slate pencil, why cannot write on paper with, 18
- Sleep, where are we when, 365
- with eyes open, why we cannot, 92
- ghosts, 367
- why heart beats during, 191
- why we go to, 365
- restless, 92
- Sling, man in action (illus.), 41
- how first made, 41
- Slings, and their drawbacks, 42
- Slow match, of early firearms, 45
- Smells, why do flowers have, 176
- Smoke-cone, in gun-firing (illus.), 28
- Smokeless powder, 35
- Smoke-rings, hard as steel, 27
- Smoke signals, of Indians, 412
- Smoke-zone, in gun firing, 111
- Sneezing, what makes us, 194
- why do we, 194
- Snowflakes, what makes them white? 409
- Space, extends, how far, 256
- Sparkle, when merry, why eyes, 92
- Spear, as a weapon, 42
- Specific gravity, meaning of, 268
- Speed, of light, 36
- Spinneret, of the silkworm, 115
- Spinning wheel, in making cloth from wool, 81
- Sponge, capillary attraction of, 18
- Sponges, breeding time of, 286
- how do they grow? 286
- how they eat, 287
- how they are caught, 287
- where they come from? 286
- Stable, underground (illus.), 158
- Stars, counted in photograph, 223
- do they shoot down? 255
- how counted, 241
- how many there are, 223
- photographed, 223
- what makes them twinkle, 38
- Steamship, beginning of (illus.), 337
- cross-section, 346
- building of a (illus.), 337
- cradle of a, 338
- double bottom, 339
- end to end section, 346-347
- funnel (illus.), 345
- gantry (illus.), 338
- hull (illus.), 341
- hull before launching (illus.), 340
- inside of (illus.), 346-347
- launching of a (illus.), 340
- launching machinery (illus.), 341
- ready to launch (illus.), 340
- plates (illus.), 339
- ribs (illus.), 338
- skeleton (illus.), 339
- turbine, weight of, 344
- turbine (illus.), 344
- Steel pen, how made, 16
- Steel rail making, blast furnace (illus.), 234
- Blooming mill and engine (illus.), 237
- dump buggy, 237
- crane, carrying ingot (illus.), 236
- ingot, 237
- ingot becomes a rail (illus.), 238
- mixer (illus.), 234
- molten steel being poured into ladle (illus.), 236
- open-hearth furnace (illus.), 235
- furnace, pouring sides of an open hearth (illus.), 235
- iron, purification of, 235
- soaking pit (illus.), 236
- furnace, temperature in, 235
- Stick, why it bends in water, 38
- making a fire with, 42
- Stockings, where it goes when the hole comes, 64
- Stone-throwing, 41
- Stones, where they come from, 494
- Story in an automobile, 181
- in a loaf of bread, 460
- in a book, 561
- in a building foundation, 496
- in a cablegram, 428
- in a barrel of cement, 95
- in a stick of chocolate, 388
- in a suit of clothes, 80
- in a lump of coal, 257
- in a bale of cotton, 470
- of a cup and saucer, 404
- of the deep sea diver, 203
- in an electric light, 305
- in an elevator, 395
- in a finger print, 520
- in a flying machine, 126
- in a gas jet, 303
- in a gun, 40
- in a honey bee, 526
- in a magnet (illus.), 326
- in a lead pencil, 466
- in lighting a fire, 289
- in a lock, 491
- in a can of paint, 224
- in a pen, 11
- in a piano, 478
- in a photograph, 22
- in “Pigs is Pigs” (illus.), 374
- in a pipe and cigar, 512
- in a railroad engine, 440
- in a coil of rope, 353
- in a ball of rubber (illus.), 378
- in a rug, 167
- in a pair of shoes, 541
- in a steel rail (illus.), 234
- in a submarine boat (illus.), 269
- in a lump of sugar, 145
- in a telegram, 412
- in the telephone, 65
- in a time piece, 313
- in a tunnel, 208
- in a drink of water, 501
- in a window pane, 246
- in the wireless, 455
- in a yard of silk, 109
- in a piece of leather, 538
- Stringed instruments, the first, 480
- discovery of, 479
- Stretching, why do we, 192
- what happens when we, 193
- Stylus, iron, 13
- the in writing (illus.), 11
- Submarine, accidents and their causes, 278
- air and how it may become poisonous, 278
- buoyancy of, 270
- “Bushnell’s Turtle,” 280
- cargo, recovering of, 285
- clearing a channel of buoyant mines (illus.), 283
- development of, 280-281
- divers’ compartment, 270
- equilibrium, 270
- explosions, 278
- first practical (illus.), 271
- gas, explosion of, 278
- “G-1” (illus.), 272
- Holland, 282
- how we look through a periscope (illus.), 276
- hydroplanes on, 270
- hydroplane, 282
- ice, under (illus.), 279
- inside of a (illus.), 272
- lens, of periscope (illus.), 276
- living quarters (illus.), 285
- mice on, 278
- mine planting inside of (illus.), 277
- Omniscope, 271
- one of the first practical, 271
- “Proctor,” first practical, 271
- “Proctor” submerged (illus.), 271
- periscope top of (illus.), 276
- rudder, horizontal, 270
- sailing close to surface (illus.), 273
- seeing in all directions at once, 276
- Simon Lake, American inventor of, 282
- steadiness of (illus.), 273
- under the ice (illus.), 279
- submergence, 270
- water pressure on, 270
- who made the first, 280
- Submarine boat, “Argonaut the First” (illus.), 269-282
- “Argonaut Junior” (illus.), 269-282
- who made the first, 280
- Submarine mines, amount of powder used, 34
- Sugar, carbonatation station (illus.), 150
- chemical laboratory in factory (illus.), 149
- circular diffusion battery in factory (illus.) 149
- filter presses (illus.), 150
- how taken from beets, 150
- sulphur station (illus.), 150
- washing the beets, 149
- Sugar factory, carbonatation station (illus.), 150
- chemical laboratory in (illus.), 149
- circular diffusion battery (illus.), 149
- filter presses (illus.), 150
- sulphur station (illus.), 150
- Suit, cost of wool in a, 83
- Sulphite of soda, used in developing, 23
- Sun, distance from earth, 141
- revolving on its axis, 511
- Sun-dial (illus.), 315
- in determining noon (illus.), 316
- concrete (illus.), 101
- Sunlight, effect on balance, 37
- Sunset, cause of colors in, 253
- Swallowing, what happens when we, 195
- Swimming, why man must learn, 125
- Switchboard, telephone, 69
- back of a, telephone (illus.), 69
- telephone, the first (illus.), 74
- Talking, how man learned talking, 18
- signs and gestures, 18
- Talking machines, 490
- Target, floating, 31
- Never seen by men firing mortar, 29
- projectile, arrival at, 24
- Tears, caused by onions, 38
- as an eye-wash, 38
- run along channel, 38
- where they come from, 94
- where they go, 94
- Teeth, why they are called wisdom, 125
- why they chatter, 218
- Telegram, how it gets there, 414
- story in a, 412
- Telegraph, cables (illus.), 424
- code, 419
- calling a messenger, 414
- waiting calls (illus.), 414
- arrival at destination (illus.), 417
- duplex, 417
- electric, 420
- electric, first suggestion of, 420
- inventor of, 420
- two men inventors of, 421
- instruments, 425
- instruments, first sending (illus.), 426
- instrument, sending, 418
- key, modern (illus.), 427
- key, a later, 427
- key, sending (illus.), 418
- line, first, 422
- messenger receives message (illus.), 415
- messages, number sent in a day, 417
- multiplex, 417
- operating room (illus.), 423
- the pony (illus.), 413
- quadruple, 417
- Wheatstone, receiver (illus.), 425
- Wheatstone sender (illus.), 425
- receiving operator (illus.), 416
- relay, the first (illus.), 426
- relay, modern (illus.), 427
- recording apparatus first (illus.), 426
- recording instrument improved, (illus.), 427
- repeater room (illus.), 424
- sending operator (illus.), 416
- sounder, modern (illus.), 427
- main switchboard (illus.), 423
- automatic typewriter (illus.), 425
- Telephone, apparatus, 65
- birthplace of (illus.), 70
- cost of number in use (illus.), 77
- display board (illus.), 65
- discovery of, 71
- feeding cable into duct (illus.), 76
- first outdoor demonstration, 75
- how an emperor saved the, 73
- forces behind your, 77
- modern distributing frame (illus.), 75
- line, the first, 72
- line lamp, 66
- pilot lamp, 66
- from bottom of ocean, 203
- operator, 67
- breaking up the asphalt pavement (illus.), 76
- a cable trouble (illus.), 76
- call routine of (illus.), 68
- beginning of service, 75
- the first switchboard, 72
- laying multiple duct subway (illus.), 76
- first practical commercial test of telephone, 75
- how wires are put underground (illus.), 76
- nine million in use, 75
- the first words over, 74
- Tens, counting in, 19
- Test, of big gun (illus.), 53
- Testing, materials and products in gun factory (illus.), 50
- artillery instruments, 24
- Tests, shooting (illus.), 48
- Things, to know about a big gun, 53
- Throats, making sounds with our, 78
- Thread, silk, made uniform (illus.), 120
- Thunder, why it precedes lighting, 140
- does it sour milk? 196
- Tickled, why we laugh when, 93
- Tides, where does water go at, low, 219
- Time, age of clocks, 391
- blacksmith’s clock (illus.), 320
- first modern clock, 319
- hour-glass (illus.), 317
- time-boy of India (illus.), 317
- where the day changes, 325
- where is the hour changed? 325
- clock in Independence Hall (illus.), 323
- clock in New York City Hall (illus.), 323
- largest clock in the world, 321
- machinery which runs a big clock (illus.), 322
- how man measured, 314
- modern clock, description of (illus.), 319
- primitive twelve-hour clock, 318
- water clocks for, 317
- water-clock (illus.), 318
- man’s first divisions of, 314
- what it is, 313
- three great steps in measuring, 316
- first methods of telling (illus.), 313
- in New Testament, 314
- sun-dial (illus.), 315
- sun-dial in determining noon, 316
- calculated at sea, 315
- tower of the winds (illus.), 318
- how told when sun casts no shadows, 317
- Tin, why used for cooking utensils, 267
- Tobacco, barn, 515
- growing crop, care of, 514
- growing under cheesecloth (illus.), 512
- grown in Cuba, 513
- cultivation of, 516
- curing of, 515
- cigars, how made, 517
- how discovered, 512
- field (illus.), 515
- figures about, 519
- filler, 518
- fertilization, 514
- where it comes from, 512
- shade growing, 517
- where does it grow, 512
- harvesting, 515
- Havana, where grown, 513
- origin of name, 512
- planting, 514
- seed beds, 514
- first care in selection, 518
- strippers, 518
- bulk sweating, 516
- wrappers, 518
- butter worm, 514
- Toes, why we have ten, 142
- Toothache, what good can come from? 410
- cause of, 410
- Torches, used in battles, 44
- Tow-line, of floating target, 31
- Trains, why harder to stop than start, 223
- Transparent, why some things are, 350
- Trees, found in coal, 261
- Tube, of a gun, 54
- Tunnels, accidents in, 218
- causes of accidents, 218
- accuracy of engineering, 215
- airlocks, description of, 213
- operation of airlocks, 213
- compressed air method, 211
- the bends, 213
- bends, the danger of, 213
- bends, the symptoms of, 213
- dangers in building, 218
- grommetting the bolts, (illus.), 214
- borings in ground (illus.), 216
- airlock bulkhead (illus.), 210
- how built, 209
- driving shield rear end of in tunnel building (illus.), 210
- caissons in Hudson tunnels (illus.), 217
- curves, how made (illus.), 216
- how shield cuts through, 212
- how dug under water, 208
- erector (illus.), 210
- erector at work (illus.), 214
- grouting (illus.), 214
- inventor of shield method, 209
- inventor of compressed air method, 211
- caulking the joints (illus.), 214
- making joints water tight, 214
- at end of journey (illus.), 216
- land end of Hudson tunnels (illus.), 217
- danger of leaks, 213
- result of leaks (illus.), 213
- concrete lining (illus.), 216
- key plate (illus.), 214
- diagrams of driving shield (illus.), 208
- biggest ever built by shield method, 209
- rear end of driving shield (illus.), 210
- driving shield front view (illus.), 209
- how the shields meet exactly (illus.), 215
- models of Penna RR. tunnel shield (illus.), 212
- Turbine, how it works (illus.), 344
- Twinkle, what makes stars, 38
- Twinkling stars, due to interference, 38
- Types of cartridges (illus.), 49
- Umbrella, who made the first, 312
- who carried the first, 312
- Uncle Sam, how name originated, 458
- Undercutting with compressed air machine (illus.), 261
- Vault of telephone cables (illus.), 67
- Velocity of a projectile, 53
- Waking, why we wake up, 365
- Walking, difficult to, straight with eyes closed, 91
- why cannot babies walk as soon as born, 180
- Wall, sounds through a thick, 79
- Water, aqueduct (illus.), 505
- Ashokan Reservoir (illus.), 502
- boiling-point of, 35-220
- drinking, where does it come from, 501
- hard, 221
- how is a big dam built, 502
- Hudson River siphon (illus.), 507
- in ocean where it came from, 218
- pumping station (illus.), 503
- real source of the (illus.), 506
- regulating chamber (illus.), 506
- reservoir, 503
- soft, 221
- as standard in measuring specific gravity solids, 268
- what made of, 348
- what makes it boil, 220
- what makes water shoot in air, 198
- what hard is, 221
- what soft is, 221
- why don’t water in ocean sink in, 219
- why does it run, 219
- why it puts fire out, 222
- why runs off a duck’s back, 233
- why sea water is salty, 351
- Watson, Thomas A., (illus.), 70
- Wave, of light changed into heat, 36
- Waves, of sound, 79
- Weight, of light, 37
- of projectiles, 53
- What does the air weigh? 398
- animal can leap the greatest distance? 122
- causes an arrow to fly? 408
- makes some people bald? 143
- keeps a balloon up? 199
- makes a ball stop bouncing, 63
- are ball bearings? 180
- happens when a bee stings? 537
- makes the hills look blue sometimes? 255
- makes me blush? 194
- was the origin and meaning of bread? 460
- is the hottest spot on earth? 239
- holds a building up? 496
- makes a bubble explode, 108
- is carbonic acid? 509
- is a cable made of? 429
- is the eye of the camera? 22
- do ocean cables look like when cut in two? (illus.), 428
- do we mean by 18-carat fine? 266
- is clay? 495
- is color? 123
- produces the colors we see? 123
- makes the colors in the rainbow? 254
- makes the colors of the sunset? 253
- are cocoa shells? 390
- is cement? 95
- is cement used for? 95
- a cement mill looks like (illus.), 96
- is cement made of? 95
- is cement used for, 95
- is concrete? 95
- makes some things in the same room colder than others? 144
- does woolen cloth come from? 80
- was the cross-bow? 44
- are diamonds made of? 351
- causes dimples? 352
- makes us dream? 366
- were man’s first divisions of time? 314
- makes things whirl around when I am dizzy? 402
- is dust? 104
- becomes of the dust? 104
- are drone bees good for? 531
- is meant by deadening a floor or a wall? 79
- causes earache? 410
- makes an echo? 200
- are the principal parts of an elevator? 396
- causes the explosion in a gas engine? (illus.), 182
- happens when anything explodes? 205
- is an element? 349
- makes the hollow place in a boiled egg? 179
- is electricity? 329
- is an electric current? 334
- makes an electric magnet lift things? 326
- do we mean by Fahrenheit? 221
- makes a fish move in swimming? 233
- is fog? 105
- makes the water from a fountain shoot into the air? 198
- makes freckles come? 125
- makes a gasoline engine go? 181
- is gravitation? 267
- does specific gravity mean? 268
- makes a cold glass crack if we put hot water in it? 63
- are ghosts? 367
- causes the gurgle when I pour water from a bottle? 63
- causes hail? 124
- is the horizon? 244
- causes a hot box? 368
- good are the lines on the palms of our hands? 402
- does horse-power mean? 256
- is hydrogen gas? 349
- makes us feel hungry? 243
- makes knots in boards? 223
- were the earliest lamps? 295
- were the lamps of the wise and foolish maidens? 295
- happens when we laugh? 93
- makes us laugh when glad? 92
- is a leyden jar? 332
- is a lodestone? 327
- makes lobsters turn red? 245
- makes the lump come in my throat when I cry? 195
- makes a match light when we strike it? 198
- would we do without matches? 292
- is a metal? 265
- is the most valuable metal? 265
- is the milky way? 255
- is a molecule? 348
- is money? 455
- is motion? 61
- made the mountains? 401
- is music? 478
- does a note in music consist of? 490
- is organic matter? 174
- is oxygen? 349
- is nitrogen? 350
- makes nitroglycerin explode so readily? 206
- causes nightmare? 367
- is pain and why does it hurt? 244
- makes the different colors in paint? 229
- is pitch in music? 489
- is the principle of the wireless? 455
- makes some pencils hard and others soft? 467
- makes rays of light? 230
- makes us red in the face? 192
- makes the rings in the water when I throw a stone into it? 197
- is rubber? 386
- is wild rubber? 387
- should I do if stung by a bee? 537
- is the cause of shadows? 495
- makes the sea roar? 401
- does the bottom of the sea look like? 220
- becomes of the smoke? 106
- and why is smoke? 105
- causes the smoke when a gun goes off? 206
- is smokeless powder made of? 206
- makes snowflakes white? 409
- depth of snow is equivalent to an inch of rain? 241
- is soap made of? 411
- makes a soap bubble? 108
- shot tower looks like? 51
- makes us sneeze? 194
- is silver? 207
- happens when we stretch? 193
- makes me want to stretch? 192
- happens when I swallow? 195
- is sound? 485
- are the properties of sound? 486
- are the sounds we hear in a sea shell? 79
- makes the sounds like waves in a sea shell? 79
- does a sounding board do? 488
- is meant by the length of sound waves? 487
- makes us thirsty? 243
- makes me tired? 403
- a great steamship looks like inside (illus.), 346
- did the first telephone look like? (illus.), 72
- occurs when we think? 194
- are the big tanks near the gas works for? 298
- makes the stars twinkle? 38
- a ship’s turbine looks like (illus.), 344
- is the largest tree in the world? 242
- happens when we telephone? 65
- makes water boil? 220
- is the boiling-point of water? 220
- causes a whispering gallery? 201
- makes a wireless message go? 455
- makes the works of a watch go? 368
- makes the white caps on the waves white? 410
- is worry? 207
- causes the wind’s whistle? 139
- makes the kettle whistle? 198
- causes wrinkles? 196
- are X-rays? 307
- is yeast? 288
- When did man first try to fly? 126
- did man begin to live? 174
- were candles introduced? 296
- was illuminating gas discovered? 302
- was wheat first used in making bread? 461
- I throw a ball into the air, while walking why does it follow me? 401
- was silk culture introduced in America? 111
- were street lamps first used? 295
- Where does bread come from? 460
- does water in the ocean go at low tide? 219
- does silk come from? 109
- are we when asleep? 365
- did the name calico come from? 123
- cement is obtained (illus.), 97
- does chalk come from? 18
- does chocolate come from? 388
- our coal comes from? 257
- does cotton come from? 470
- does the day begin? 324
- does the day change? 325
- did the term Dixie originate? 123
- does honey come from? 526
- is the horizon? 244
- does the hour change? 325
- the gas is taken from the coal (illus.), 299
- did all the names of people come from? 20
- did the expression “kick the bucket” originate? 321
- does leather come from? 538
- do living things come from? 174
- did life begin on earth? 174
- do we get ivory? 239
- do lead pencils come from? 466
- does the wooden part of a lead pencil come from? 469
- does a light go when it goes out? 36
- does linseed oil come from? 227
- does paint come from? 224
- does the rain go? 222
- are the best Persian rugs made? 167
- does rope come from? 353
- does salt come from? 493
- do we get soda? 494
- do all the little round stones come from? 494
- does the part of a stocking go that was where the hole comes? 64
- does sound come from? 78
- do school slates come from? 495
- do shoes come from? 541
- do sponges come from? 286
- do tears come from? 94
- do the tears go? 94
- did the name tobacco originate? 512
- is Havana tobacco grown? 513
- does tobacco come from? 512
- does tobacco grow? 512
- did all the water in the ocean come from? 218
- does our drinking water come from? 501
- does most of our wool come from? 81
- does the wind begin? 139
- is the wind when it is not blowing? 139
- does wool come from? 80
- did the term Yankee originate? 243
- Wheat, bread loaves of the world, 459
- grinding (illus.), 464
- harvesting (illus.), 460
- scouring of, 463
- tempering of, 463
- when first used in making bread, 461
- will it grow wild? 461
- Wheel-lock rifle (illus.), 46
- Whispering gallery, accidental, 201
- cause of, 201
- what it is, 201
- Whistle, what makes the kettle? 198
- White Lead, making (illus.), 225
- buckles, before corrosion (illus.), 225
- buckles after corrosion (illus.), 225
- buckles, making, 225
- Who started to make clothing from wool in America? 81
- discovered electricity? 333
- invented electric telegraph? 420
- made the first felt hat? 239
- made the first cent? 458
- made the first submarine boat? 280
- first discovered the silkworm? 109
- first discovered the power of gunpowder? 44
- invented flying? 126
- made the first piano? 478
- brought the first sheep to America? 80
- first wove silk thread into cloth? 109
- make the first shoes? 541
- made the first umbrella? 312
- Why don’t the air ever get used up? 140
- can’t we see air? 140
- do we grow aged? 196
- does an apple turn brown when cut? 106
- do coats have buttons on the sleeves? 64
- has a long coat buttons on the back? 64
- cannot babies walk as soon as born? 180
- are some people bald? 144
- don’t the birds stay South? 408
- does a ball bounce? 63
- does a balloon go up? 199
- do we call voting balloting? 122
- does a barber pole have stripes? 310
- do some things bend and others break? 62
- do the birds come back in the Spring? 407
- do birds sing? 408
- do birds go South in the Winter? 407
- are birds’ eggs of different colors? 233
- has a bee a sting? 336
- can you blow out a candle? 21, 36
- are bubbles round? 108
- does red make a bull angry? 490
- do we get a bump instead of a dent when we knock our heads? 201
- can’t we burn stones? 105
- has a long coat buttons? 64
- is bread so important? 460
- do I get out of breath when running? 191
- do we call a cab a hansom? 122
- does a hen cackle after laying an egg? 233
- do children like candy? 409
- is cement called Portland cement? 95
- do I get cold in a warm room? 125
- is it cold in winter? 141
- does cold make our hands blue? 192
- does an ear of corn have silk? 170
- do we count in tens? 10
- we cannot see in the dark, 91
- does the dark cause fear? 352
- do we have to die? 245
- does a dog turn round and round before he lies down, 229
- do we know we have dreamed when we wake up? 367
- does eating candy make some people fat? 409
- doesn’t an elevator fall? 397
- do our eyes sparkle when we are merry? 92
- do the eyes of some pictures follow us? 35
- is it difficult to walk straight with my eyes closed? 91
- do I get red in the face? 192
- are some faculties stronger than others? 403
- is a fire hot? 401
- does a fire go out? 37
- we fear the dark? 352
- cannot fishes live in air? 232
- do we have finger nails? 142
- are our fingers of different lengths? 142
- have we five fingers on each hand and five toes on each foot? 142
- do we have finger nails? 142
- does a gasoline engine go? 181
- do girls like dolls? 368
- is gold called precious? 266
- are gold and silver best for coining? 457
- is some gun-powder fine and others coarse grained? 206
- are some guns called gatling guns? 310
- does a glow-worm glow? 231
- do we stop growing? 195
- do we have hair? 143
- does the hair grow after the body stops growing? 144
- don’t my hair hurt when it is being cut? 143
- does my hair stand on end when I am frightened? 143
- is the right hand stronger than the left? 309
- does my heart beat faster when I am scared? 191
- does the heart beat when the brain is asleep? 191
- do our hearts beat faster when we are running? 191
- do they call it a honeymoon? 31
- is a horseshoe said to bring good luck? 311
- does it hurt when I cut my finger? 143
- we cry when hurt, 93
- does iron turn red when red hot? 107
- does iron sink in water? 106
- doesn’t an iron ship sink? 106
- do we have twelve men on a jury? 239
- does a lamp give a better light with the chimney on? 37
- are there many languages? 197
- do we laugh when glad? 92
- is lead so heavy? 267
- do they call them lead pencils? 466
- must life be reproduced? 174
- are some people light and others dark? 402
- did people of long ago live longer than we do now? 199
- do we use metal for coining? 456
- do they call it the milky way? 255
- do we need money? 455
- does the moon travel with us when we walk or ride? 399
- should we not sleep with the moon shining on us? 366
- do my muscles get sore when I play ball in the spring? 310
- does a nail get hot when hammered? 230
- do we have only seven octaves on a piano? 480
- does the ocean look blue at times? 219
- does oiling the axle make the wheel turn more easily? 400
- does an onion make the tears come? 38
- can’t I write on paper with a slate pencil? 18
- does a pencil write? 18
- are some races white and others black, yellow and brown? 537
- do they call it pin money? 231
- do we call them pistols? 46
- do plants produce seeds? 175
- does a poker get hot at both ends if left in the fire? 107
- does rain make the air fresh? 222
- are most people right-handed? 403
- don’t we make roads perfectly level? 104
- don’t we use pure rubber? 380
- does salt make us thirsty? 351
- don’t the scenery appear to move when I am in a street car? 399
- does the scenery appear to move when we are riding in a train? 399
- can cats and some other animals see in the dark? 91
- can we see farther when we are up high? 245
- do I turn white when scared? 193
- does silver tarnish? 266
- does the sheep precede the plow in civilizing a country? 81
- is the sky blue? 253
- do I sneeze? 194
- do we see stars when hit on eye? 268
- many stars are there? 223
- does a stick in water bend? 38
- does a sound stop when we touch a gong that has been sounded? 78
- can we make sounds with our throats? 78
- do people shake with the right hand? 231
- do we go to sleep? 365
- does it seem when we have slept all night that we have been asleep only a minute? 366
- can’t we sleep with our eye open? 92
- we can hear through speaking tubes, 487
- does a human being have to learn to swim? 125
- are cooking utensils made of tin? 267
- do we use copper telegraph wires? 266
- do my teeth chatter? 218
- are some things transparent and others are not? 350
- do I laugh when tickled? 93
- can we think of only one thing at a time? 193
- does thunder always come after the lightning? 140
- do we call them wisdom teeth? 125
- are some roads called turnpikes? 104
- is the sea water salt? 351
- will water run off a duck’s back? 233
- do we worry? 207
- don’t the water in the ocean sink in? 219
- is it warm in summer? 141
- does water run? 219
- do we say water is soft or hard? 221
- does a piece of wood float in water? 106
- do we wake up in the morning? 365
- do I yawn? 173
- does yeast make bread rise? 288
- Will people all be bald sometime? 144
- the sky ever fall down? 255
- Windows, how an explosion breaks them, 62
- Wireless, accidents, prevention of, 449
- aerial on R. R. stations (illus.), 451
- aerial on ship (illus.), 455
- antennæ, 447
- antennæ on trains (illus.), 450
- battery, 447
- coil, 447
- compass, 454
- development of, 454
- direction finder, 454
- distance of sending, 448
- equipment, 446
- first Marconi station, 452
- how it reaches ships at sea, 446
- icebergs (illus.), 449
- in the army (illus.), 447-448
- inventor of, 452
- key, 447
- masts, height of, 448
- G. Marconi, portrait, 452
- on trains (illus.), 450
- prevents accidents, 449
- principles of, 455
- receiving station in U. S. Army (illus.), 451
- spark gap, 447
- stations, shore (illus.), 446
- stations on trains (illus.), 450
- transmission automatic (illus.), 453
- transmission of messages (illus.), 453
- what kind of signs are used in? 446
- why don’t the message go to the wrong stations, 455
- world-wide use, 454
- Wires, copper telegraph, 266
- how put underground (illus.), 76
- wire-wound gun, 54
- Wonders performed by electric lift magnet (illus.), 326
- Wool beaming (illus.), 89
- bobbin in weaving machine, 86
- Burling (illus.), 88
- burr picker, 87
- carding, 85
- carding, finisher in cloth making (illus.), 89
- chloride of aluminum in making cloth, 87
- cleaning, 85
- made clothing from, 81
- combing (illus.), 86
- cost of in a suit of clothes, 83
- crop of the United States, 82
- dyeing, 85-87
- fabrics, 85
- fiber description, 83
- finishing, box (illus.), 87
- finish, perching (illus.), 90
- fulling cloth (illus.), 90
- gilling after carding (illus.), 86
- gilling and making top after combing (illus.), 86
- gilling (illus.), 87
- greasy matter in, 84
- how we get it off the sheep, 82
- how much does a sheep produce, 83
- how much does America produce, 82
- how made into cloth, 85
- how woolen cloth is made perfect, 88
- how shipped, 82
- loom, 86
- mending, perching (illus.), 88
- mending room (illus.), 88
- woolen mule spinning (illus.), 89
- napping, 89
- next to food as a vital necessity, 81
- piece dyeing (illus.), 90
- quality of a hundred years ago, 83
- raised to sell to manufacturers, 81
- reducer machine in wool making (illus.), 87
- ring twisting (illus.), 89
- shipped to manufacturers, 82
- shuttle in weaving, 86
- scouring (illus.), 85
- sorting (illus.), 84
- spinning process, 86
- spinning, 89
- English cap spinning, 89
- in one suit of clothes, 83
- sulphuric acid solution in making cloth, 87
- teasel, 89
- tramper, 82
- in United States, bulk of, 82
- warp thread, 86
- web, 86
- weaving (illus.), 88
- where does most of our wool come from? 81
- woof of, 86
- made into yarn, 86
- yarn inspecting (illus.), 89
- yolk of, 84
- Woolen cloth, ready for market (illus.), 90
- Woolens and worsteds, difference between, 84
- Woolworth building (illus.), 395
- Words, formation of, 19
- the first over a telephone, 74
- World’s bread loaves (illus.), 459
- Worry, definition of, 207
- what it is, 207
- Why we, 207
- Worsted carding (illus.), 85
- fabrics, 85
- Worsteds and woolens, difference of, 84
- Wright Brothers, first successful flights, 130
- Wrinkles, what causes, 196
- Writing, brush, the (illus.), 13
- earliest ways of, 12
- first done upon rocks, 11
- first imitation of, 12
- first metallic pen introduced, 15
- fluids for developing, 13
- how man learned to, 11
- how the monks did their, 14
- how a pen writes, 18
- modern way of, 16
- paper for, earliest, 14
- pen, invention of, 11
- pen, first steel (illus.), 15
- quill, the (illus.), 14
- Reed, the, in (illus.), 12
- steel tube pen in (illus.), 15
- steel pen, modern (illus.), 16
- Stylus, the (illus.), 11
- with chalk, 18
- why a pencil writes, 18
- X-rays, what are they? 307
- Yankee, where word originated, 243
- Yarn, made from wool, 86
- Yawning, why do, 173
- is it infectious, 192
- Yeast, what it is, 288
- why it makes bread rise, 288
- Yes, meaning of nod, 19
- Zollner, Casper, inventor of rifling, 46