E., on Saturn's rings, 200.
Kepler, lunar crater, 223.
Kinetic theory of gases, 116.
Kirkwood, Daniel, on asteroids, 131.
Lagrange on Olbers's theory, 139.
Lick Observatory and Mars's canals, 92.
Life, a planetary phenomenon, 10.
in sea depths, 62.
on planets, 62, 63.
prime requisites of, 64.
resisting extreme cold, 123.
universality of, 9.
Loewy and Puiseux, on lunar atmosphere, 248.
on lunar "seas," 234.
Lowell, Percival, description of Mars, 108.
on markings of Venus, 60.
on Mercury's rotation, 33.
on rotation of Venus, 77.
sees Mars's canals, 92.
theory of Martian canals, 101.
Lucian, on appearance of earth from moon, 213.
Lyman, C.S., observes Venus's atmosphere, 55.
Mars, age of, 89.
atmosphere of, 86, 115, 117.
bands of life on, 104.
canals on, 90.
described by Schiaparelli, 93.
gemination of, 91, 105.
have builders of, disappeared? 107.
and irrigation, 101.
and lines of vegetation, 102.
and seasonal changes, 99.
and water circulation, 100.
carbon dioxide on, 118.
circular spots or "oases" on, 103.
colors of, 89.
dimensions of, 86.
distance of, 85, 86.
enigmatical lights on, 111.
gravity on, 86.
inclination of axis, 86.
length of year, 86.
Lowell's theory of, 101.
light and heat on, 85.
moonlight on, 128.
orbit of, 85.
polar caps of, 87, 118.
possible size of inhabitants, 106.
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