INDEX
Agassiz, Alexander, on deep-sea animals, 63.
Asteroids, the, 16, 129.
brightness of, 130.
imaginary adventures on, 146.
life on, 144.
number of, known, 129.
orbits of, 132.
origin of, 138, 143.
size of, 129.
Aristarchus, lunar crater, 226.
Atmosphere, importance of, 20.
Bailey, Solon I., on oppositions of Eros, 134.
Barnard, E.E., discovers fifth satellite of Jupiter, 181.
measures asteroids, 129.
on Saturn's rings, 205.
Belopolski, on rotation of Venus, 79.
Ceres, an asteroid, 129, 130.
Clefts in the moon, 226.
Copernicus, lunar crater, 223, 242.
Darwin, George H., on Jupiter and Saturn, 206.
on origin of moon, 235.
theory of tidal friction, 32.
Davy, Sir Humphry, on Saturn, 190.
Dawes sees canals on Mars, 93.
Deimos, satellite of Mars, 125.
Denning, W.F., description of Jupiter, 175.
De Vico on rotation of Venus, 76.
Dewar, James, discovers free hydrogen in air, 232.
De Witt discovers Eros, 133.
Dick, Thomas, on Saturn, 201.
Douglass, A.E., sees Mars's canals, 92.
sees clouds in Mars, 119.
Doppler's principle, 79, 200.
Earth and moon's orbit, 217.
birth of moon from, 236.
change of distance from sun, 27.
less advanced than Mars, 89.
older than Venus, 58.
seen from Mercury, 41.
seen from Venus, 69-71, 75.
seen from moon, 214.
Earth, similarity to Venus, 46.
supposed signals to and from Mars, 110.
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