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Rh Meteorites,  difference from meteors, 296-297 constituent elements of, 299 composition of meteorites, 348-352 Ovifak and Coon Butte "irons," 349-352 not cometary, 307 Tschermak's volcanic doctrine, 307, 310 Lockyer and Prof. Newton's theory, 308 origin of meteorites, 308-309 meteorites volcanic ejects, 310 whence, 311-355 objections considered, the atmosphere, 341, 345 career of a meteorite, 345, 347 recapitulation of argument, 353-355 Milky Way, the, in remote antiquity, 20 Million years ago, the star-groups of a, 12, 15-18, 20 Mizar, the system of (see Great Bear). Molecules (see Gases). Moon, the, of the coal measures, 18 conditions of life on the, 45-48 compared with Mars, 121 absence of atmosphere, 126, 131 Mott, Mr. A., his theory of lunar atmosphere, 128

, the spiral in Canes Venatici, 35, 37 the Crab, 38 spectrum of a nebula, 155 old theory of nebulæ, 155 the new theory, 157 the problem of the Great Nebula in Andromeda, 158-159 the Great Nebula in Orion, 162, 214 the story of the Nebula in Taurus, 214-215 process of nebular condensation, 38 Nebula, permanent appearance of nebulæ, 217 Nebular Hypothesis, Laplace, 212,217-219 Herschel, 212-217 argument from the planets, 220-222, 225 argument from the comets, 222-224 argument from the sun, 226-229 argument from the earth, 228 Neptune, conditions of life on, 48-49 discovery of, 148 Newcomb, Prof., our sidereal system, 210-212, 217, 219 on comets and meteorites, 308 Newton and the movements of the Pole, 67

in remote antiquity, 20 the Great Nebula in, 162, 214, 236 Theta Orionis and its relation to the nebula, 236-239 Ovifak "meteoric iron" of terrestrial origin, 349-352

, M., observations of Mars, 142 Photography, proof of earth's rotation, 55 application to astronomy, 168 chart of the heavens, 167 photo-measurements of annual parallax, 167 Pickering, Prof., his study of Mizar, 192-193 Planets, the, in the carboniferous era, 19 through the telescope, 40 clouds and oceans of, 41 comparative sizes of, 41 conditions of life on, 44-45 favourable times for observation, 106-107 the law of gravitation, 198