Elger, T.G., on cracks in moon, 227.
  on Tycho’s rays, 246.

Ephemeris, how to use, 260, 264.

Eros, an asteroid, 131-134, 136, 137.

Flammarion, C., observes Venus’s atmosphere, 56.
  on plurality of worlds, 8.

Forbes, Prof.  George, on ultra-Neptunian planet, 210.

Galileo on lunar world, 215.

Gravity, as affecting life on planets, 20, 46.

Hall, Asaph, discovers Mars’s moons, 90.

Herodotus, lunar crater, 227.

Herschel, Sir John, on Saturn, 185.

Holden, E.S., on photograph of lunar crater, 242.

Huggins on Mercury’s atmosphere, 21.

Inhabitants of foreign planets, 1, 4, 5.

Interplanetary communication, 1, 3, 72, 110, 112.

Juno, an asteroid, 129.

Jupiter, cloudy aspect of, 165.
  density of, 162.
  distance of, 161.
  equatorial belts on, 165.
  future of, 180.
  gravity on, 162.
  great red spot on, 169.
  markings outside the belts, 168.
  and the nebular theory, 178.
  once a companion star, 179.
  polar compression of, 161.
  possibly yet incandescent, 177.
  question of a denser core, 176.
  resemblance of, to sun, 174.
  rotation of, 161, 173.
  satellites of, 166, 181.
  seen from satellites, 182.
  size of, 160.
  solar light and heat on, 182.
  south belt of, 172.
  surface conditions of, 163.
  theories about the red spot, 170.
  trade-winds and the belts of, 167.
  various rates of rotation of, 173.
  visibility of rotation of, 166.

Keeler, J.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.