Jupiter, size and weight of his satellites, 43, 115
the four satellites known to the Chinese, 95
why the satellites are not distinguishable, 96-99
their distances and periods of revolution, 110
discovery of the fifth satellite, 99, 105
lustre, size, distance, period of the fifth satellite, 107-108
orbit of the fifth satellite, 112
the problem of the satellites, 101
the work of Laplace, 102
interest of the discovery, 100, 103
value of the discovery, 104, 109
Kepler' s law, 109-110
K
Kepler's law and Jupiter's fifth satellite, 109
L
on the extinction of the sun, 274-275
Laplace and the satellite system of Jupiter, 102
the Nebular Hypothesis, 212, 217-219
Latitude, how to find, 69
value of, in observatories, 171, 73-76
Lexell's comet in collision with Jupiter, 306
Lick telescope and recent discoveries, 104, 105
its practical power, 138
Lockyer's theory as to comets and meteorites, 308
Lyræ Delta, the point to which the solar system is moving, 25
Epsilon, 201
M
the destiny of species, 253-256
heat essential to life, 259
sources of heat, 261-263
limit to the sun's duration, 272
extinction of the race, 274-275
Mars in the carboniferous era, 19
conditions of life on, 50-51
discovery of the satellites, 99
orbits of the satellites, 117
orbit of Mars, 116
its distance from the earth, 117
favourable oppositions, 117
their recurrence, 120
Mars compared with the moon, 121
compared with Venus, 121
the most world-like of the planets, 124
dimensions and weight of Mars, 124
atmosphere, 125-137
its atmosphere compared with earth's, 135-136
composition of its atmosphere, 136-137
the gases on Mars, 133
Mars the smallest planet containing air and water, 134
clouds on Mars, 135
water on Mars, 137
Mars through the telescope, 138, 140
its polar snows, 140-141
its "canals," 141-142, 144
the stage of physical evolution on Mars, 145
life and intelligence, 145-147
Schiaparelli's observations, 141
observations of Terby and Perrotin, 142
Meteors, connection with comets, 167, 297-298
difference between meteors and meteorites, 167, 296-297
the Leonids, 168, 295, 297
the "radiant," 298
Meteorites, character of, 295, 296
