Daldorff, on climbing perch, 248, 249

Dampier, on frigate-pelicans plundering boobies, 284;
on monkeys hammering oyster shells with stones, 481

Daphnia pulex, seeking light, especially yellow ray, 23

Darwin, Charles, on apparent intelligence of worms, 24;
of oyster, 25;
of snail, 27;
Mr. Hague's letter to, on powers of communication in ants, 54-7;
observations on ants keeping aphides, 60, 61;
on ants making slaves, 64, 66, 67;
communications of Lincecum to, on harvesting ants, 103, 107;
on proportional size of ants' brain, 140;
communication of Müller on powers of communication in bees, 157;
origin and development of cell-making instinct, 173-7;
instincts of neuters, 181;
quotation in MS. from Sir B. Brodie on bees supporting their combs, 185-6;
his 'law of battle' in relation to spiders, 205;
intelligence of crab, 233;
his theory of sexual selection, 279-82;
sense of smell in vultures, 286;
on Wallace's theory of correlation between colour of sitting birds and form of their nests, 299;
instincts of cuckoo, 304-6;
birds dreaming, 312;
Gauchos taming wild horses, 329;
memory of horse, 330;
intelligence of bear, 352;
of elephant, 398, 402;
collective instinct of wolves, 436;
duration of memory in dogs, 438;
intelligence of Eskimo dogs, 462;
reasoning of retriever, 463-4;
maternal care and grief of monkey, 472;
sense of ludicrous in monkeys, 476;
curiosity and imitativeness of monkeys, 477;
imitativeness of man, 477-8;
intelligent observation displayed by monkeys, 479, 480

Darwin, Erasmus, on bees ceasing to store honey in Barbadoes, 187;
wasp dismembering fly to facilitate carriage, 195;
unmoulted crab guarding moulted, 233;
crows breaking shells by dropping them on stones, 283;
bird shaking seed out of poppy, 286;
elephant acting nurse to young child, 408

Darwin, F., on bees biting holes through corollas, 189

Davis, on instincts of larvæ of bombyx moth, 239

Davy, Dr., on instincts of alligators, 256, 257;
taming cobra, 265;
performing operation on elephants, 400

Davy, Sir H., on eagles teaching young to fly, 290

Day, F., on intelligence of fish, 244-52

Deceitfulness, of elephant 410;
of dog, 443, 444, 450-52, 457, 458;
of monkey, 494

Deer, intelligence of, 336, 338, 339

De Fravière, on powers of communication in bees, 158;
their scouts, 168

Descartes, his hypothesis of animal automatism, 6

Dicquemase, on intelligence of oyster, 25

Dipterous insects, intelligence in finding way out of a bell-jar, 153, 154;
gad-fly, 230;
house-fly, 230, 231

Division of labour, see Co-operation

Dog, ringing bell, 423;
knocking knocker, 423;
collective instinct of, 435, 436;
general remarks on psychology of, as influenced by domestication, 437, 438;
memory of, 438;
emotions of, 438-45;
pride and sensitiveness, 439-42;
intolerance of pain, 441;
emulation and jealousy, 442, 443;
sense of justice, 443;
deceitfulness, 443, 444;
sense of ludicrous and dislike of ridicule, 444, 445;
general intelligence of, 445-70;
communicating ideas, 445-7;
instances of reason, 447-69

Dolomedes fimbriata, 213

Doras, 248

D'Osbonville, on monkeys administering corporal chastisement to their young, 482, 483

Dreaming, of birds, 269, 312;
of ferrets, 347

Duchemin, M., on toads killing carp, 254

Duck, conjugal fidelity of, 270, 271;
conveying young on back, 289

Dugardin, on communication among ants, 49;
in bees, 156

Duncan, on cunning of a dog, 451

Dzierzon, on cause determining sex of bees' eggs, 162;
bees repairing injuries to their cells, 186



Earwig, 229, 230

Ebrard, on co-operation of ants, 132

Echinodermata, movements of, 23

Edmonson, Dr., on crows punishing offenders, 323, 324

Edward, on intelligence of frogs, 255;
sympathy of terns for wounded companion, 274, 275;
crows breaking shells by dropping them on stones, 283;
co-operation of turnstones, 321

Edward, H., on honey-making ants, 111-14

Eimer, Dr., on voluntary and involuntary movements of Medusæ, 22, 23

Elephant, general remarks upon, 386;
memory of, 386, 387;
emotions of, 387-96;
vindictiveness, 387-9;
sympathy, 389-90;
rogue, 393, 394;
dying under effects of emotion, 395, 396;
general intelligence of, 396-410;
enduring surgical operations, 399-400;
vigilance, 401;
formation of abstract ideas, 401, 402;
intelligence of tame decoys, 402-6;
of tame workers, 306-8;
thatching their backs, 308, 309;
removing leeches, and fanning away flies, 309, 310;
concealing theft, 410

Ellendorf, Dr. F., on leaf-cutting ants, 95, 96;
on ants making a bridge, 137

Elliot, on collective instinct of wolves, 433

Emery, J., on powers of communication in bees, 157

Emulation, of birds, 277;
of dogs, 442

Encyclopædia Britannica, on bees following floating hives, 149;
battles of queen-bees, 163, 164;
parasitic instincts in birds, 306

Endurance, of pain by wild dogs, 441;
of surgical operations by eagle, 313, 314;
by elephants, 399, 400;
by monkey, 482

Engelmann, on Daphnia pulex seeking yellow light, 23

Epeira aurelia, Mr. F. Pollock on perfection of web built by young, 217

Erb, G. S., on intelligence of deer, 338, 339

Esox lucius, 246

Espinas, on co-operation of ants, 130




Faister, Mdlle de, her tame weasel, 346

Falcon, variations in nest-building, 299

Faraday, J., on intelligence of skate, 251

Fascination, alleged, by snakes, 263, 264

Fayrer, Sir J., on fascination by and charming of snakes, 264

Fear, in horses, 329;
in ruminants, 334;
in rabbits, 355;
in rats, 360
excited in dogs by portraits, 455-7;
in monkey by snakes, 477,
and by imitation monkey, 495

Ferret, 347

Fire-flies, stuck on nests by baya-birds, 294

Fish, 241-53;
comparison of brain with that of invertebrata, 241;
emotions, 242-7;
nidification, courtship, and care of young, 242-6;
pugnacity, and social feelings, 242;
anger, 246, 247;
play, jealousy, curiosity, 247;
angler, 247, 248;
jaculator, 248;
travelling over land, 248;
climbing trees, 248, 249;
migrations, 249, 250;
general intelligence, 250-53

Fisher, J. F., on hen removing eggs with her neck, 288

Fleeson, Captain B., on honey-making ants, 111-14

Fleming, W. J., on intelligence of horse, 330

Fleury, Cardinal, on intelligence of ants in making bridges, 135

Forbes, on nidification of tailor-bird, 293

Forbes, James, on monkey begging for dead body of companion, 472

Forel, on ants;
recognising slaves, 43;
and fellow-citizens, 44;
swarming habits, 58;
experiment in rearing together hostile species, 59, 60;
tunnelling to obtain aphides, 61;
warfare, 68-77;
play, 88;
intelligence shown in architecture, 129

Forsteal, on termites, 198

Forster, W., on intelligence of a bull, 338

Fothergill, Percival, on reasoning power of a dog, 466

Fouillouse, J. de, on intelligence of hares, 357, 358

Fox, 426-33;
lying in wait for hares, 426, 427;
avoiding traps, 427-30;
allowing itself to be extricated from trap, 431;
catching crabs with tail, 432;
collective instinct in hunting, 433

Fox, C., on intelligence of porpoises, 328

Frankland, Mrs., on cock bullfinch recognising portrait of hen, 311

Franklin, on powers of communication in ants, 49

Franklin, Dr., on sympathy in parrots, 276

Frogs, 254, 255

Frost, Dr., on cat sprinkling crumbs to attract birds, 418, 419

Furniss, J. J., on elephants thatching their backs, 408, 409