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 Matter, as common property, 4.

Memnonia, 60.

Mercator, map of Mars on projection, 143, and after Appendix.

Mercury, ellipticity of disk of, 25; evidence of atmosphere about, 57; cusps of, 57; critical velocity of, 58, Appendix, Note I.

Meteorites, theory of canals as made by, 152.

Micrometric measures, of diameters, by Mr. Douglass, 27.

Mind, universality of, 4.

Mist, sunrise, 46; sunset, 46, 157.

Mitchell Mountains, 87.

Molecules, kinetic theory of, 53; speed of, 54, Appendix, Note I.

Moon, cosmically dead, 2; relative orbit and size of, 4; changes on, 32; atmosphere of, 57.

Mountains, 66 ; how detected on a planet, 43; as seen on terminator, 48, 69, 167 et seq.

Names, of planets, 207.

Nectar, the, 99; double, 194.

Neptune, relative orbit and size of, 5; probable ellipticity of disk of, 25; evidence of atmosphere about, 57; critical velocity of, Appendix, Note I.

Newton, law of gravitation, 10.

Nice, observatory of, 138.

Night, on Mars, 19.

Nitrogen, speed of molecules of, 57, Appendix, Note I.

Noachis, strait between it and Hellas, 115.

Nomenclature, of Martian markings, 94, 95, 141, 142; meaning of Schiaparelli's, 142.

Oases, 131, 176 et seq.; shape of, 178, 187; size of, 179; on Eumenides-Orcus, 181; on Pyriphlegethon, 182; on Gigas, 182. (See Spots.)

Ophir, 60.

Opposition, of Mars, 13.

Orbit, of Mars, 8; compared to the Earth's, 10; eccentricity of, 24.

Oxygen, speed of molecules of, 53, Appendix, Note I.; in free state, 57.

Parabolic velocity, 55.

Pearl-bearing Gulf, the, 96, 156.

Peninsulas, comet-tail, 103.

Perihelion, of orbit of Mars, 11.

Perrotin, detection of the Phison, 137, 138; confirmation of canals of Schiaparelli, 138.

Phase, of Mars, 19, 37, 46.

Phasis, the, 161.

Phison, the, shown double, 106; name of, 142; double, 190; doubling of, 195.

Phobos, orbit and size of, Appendix, Note IV.

Phoenix Lake, the, 99, 100, 133; canals near, 162; relative conspicuousness of, 183; polariscopic observation of, 185.

Photography, of planet, 93.

Pickering, Prof. W. H., estimate of height of cloud, 71; polariscope observations, 80, 185; observations of rift in polar cap, 85; an open polar sea, 88, 175;

120; names by, 141.

Planets, name of, 1; relative orbits

and sizes of, 4, 5; as wandering stars, 9; as a solar family, 10.

Polar caps, 22, 33, 76. (See South polar cap.)

Polar flattening, 25, 27; amount of, 42.

Polariscope, observations on polar sea, 80; on so-called seas, 109, 120; on the Solis Lacus and the Phoenix Lake, 185.