Galaxias, the, 62.
Ganges, the, 98; length of, 133; canals near, 156; double, 190, 193, 194.
Gases, on the Earth, 50; on Mars, 50; effect of, on atmosphere, 51.
Gemination, of canals, 190 et seq.
Gigas, oases on the, 182.
Gihon, name of the, 142.
Glacial epochs, 24.
Glaciation cracks, theory of the canals as, 152.
Gorgon, the, 164.
Gravitation, law of, 10.
Gravity, on the Earth, 19; on Mars, 19; effect of, on atmosphere, 51.
Green, N. E., observations at Madeira, 87; map of Mars, 141.
Gulf of the Titans. (See Sinus Titanum.)
Hades, the, 194.
Hammonis Cornu, neck between it and Hellas, 119.
Heat, on Mars, 13; inherent, of Mars, 30.
Hellas, 105; strait between it and Noachis, 115; between it and Ausonia, 115; neck between it and Hammonis Cornu, 119.
Hesperia, change in, 116, 118.
Hourglass Sea, the, 21.
Huyghens, drawing of Mars, 21.
Hydrogen, speed of molecules of, 54, Appendix, Note I.; in free state, 56.
Ice, particles of, in Martian air, 49, 82.
Ice-cap. (See Polar cap, and South polar cap.)
Indus, the, first seen, 157.
Inhabitants, of Mars, 127, 128, 204 et seq.
Irregularities, on terminator, not mountainous, 66.
Irrigation, necessity for, 128, 130; theory of, supported, 172, 202.
Islands, south temperate chain of, 115.
Jupiter, relative orbit and size of, 5; ellipticity of disk of, 25; evidence of atmosphere about, 57; discovery of satellites of, 140; critical velocity of, Appendix, Note I.
Kepler, laws of solar system of, 10.
Lake of the Sun. (See Solis Lacus.)
Lakes, of Mars, 184.
La Place, theory of primal nebula of, 4.
Libya, 105.
Life, extra-terrestrial, 5.
Light, on Mars, 13.
Limb, of Mars, 46.
Limblight, 46.
Linnè, 32.
Mädler, Beer and, on north polar cap, 78.
Map, of Mars, 92 et seq., 141 et seq., and at end of Appendix.
Maraldi, study of polar caps, 22.
Mare Cimmerium, 120.
Mare Erythraeum, 120.
Markings, a peculiarity of the Martian, 123, 124; bluish-green, 108, 133; reddish-ochre, 108, 133.
Mars, passim. (See particular headings.)
Martian life, 202.
Martians, as different from men, 204; probability of, 209 et seq.
Mass, of Mars, how determined, 16.
