LIST OF ILLUSTRATIONS.

Page.
Hipparchus in the Observatory at Alexandria Frontispiece.
The Solar System 15
The Pleiades 19
Sun-spots 29
Phases of Mercury before Inferior Conjunction—Evening Star 50
Appearance of the Full Moon 63
One Form of Lunar Crater 69
The Earth as Seen from the Moon 71
Passage of the Earth and the Moon through the Tail of a Comet 76
Passage of the Comet of 1843 Close to the Sun 79
Meteor Emerging from Behind a Cloud 84
The Great Shower of Shooting-stars, November 27, 1872 90
Constellation of the Great Bear 108
The Great Bear 50,000 Years Ago 109
The Great Bear 50,000 Years Hence 109
Constellation of Orion as it Appears Now 110
Constellation of Orion 50,000 Years Hence 111
Position of Planets Inferior to Jupiter—Showing the Zone of the Asteroids 123
Comparative Size of the Planetary Worlds 130
A Typical Sun-spot 135
A Solar Eruption 138
Sun-flames, May 3, 1892 143
Solar Corona and Prominence 152
Comparative Size of the Earth and Sun 155
The Moon—an Expired Planet 159
The Lunar Crater Copernicus 170
Lunar Eruption—Brisk Action 172
Lunar Eruption—Feeble Action 173
Nicolaus Copernicus 176
Phases of Venus 186
Mars and the Path of its Satellites 191
General Aspect of Jupiter—Satellite and its Shadow 200
Satellites of Jupiter Compared with the Earth and Moon 206
The System of Jupiter 208
Orbits of Nine Comets Captured by Jupiter 213
Saturn and the Earth—Comparative Size 215
Ideal View of Saturn’s Rings and Satellites from the Planet 222
Great Astronomers of Earlier Times 227
The Great Comet of 1811 247
Donati’s Comet, 1858 249
Great Comet of 1744 254
The First Comet of 1888—June 4 255
Great Comet of 1680 260
Great Comet of 1769 261
Baron Alexander Von Humboldt 264
A Telescopic Field in the Milky Way 270
Cygnus, Constellation of 279
Stars whose Distances are Best Known 281
Lyra, Constellation of 297
Constellations in the Northern Hemisphere 300
A Cluster of Stars in Centaurus 305
The Great Nebula in Andromeda, Compared with Size of the Solar System 307
A Cluster of Stars in Perseus 332
Hercules, Constellation of 338
The Great Bear, Constellation of 341
The Prism and Spectrum 344
The Spectroscope 345
Spectra, Showing the Dark Lines 347
Great Astronomers of Later Times 377
Sir Isaac Newton 386
Eye-piece of Lick Telescope 407
Lick Observatory 409
Professor E. E. Barnard 410