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 INDEX

 A Abnormality, the survival of original state, 144, 146. Absorption in spectrum, planetary, 52, 161. of Uranus, 118. of Jupiter, 152. of Saturn, 152. Achilles, 94. Adams, 119, 121. Adams, Mr. J. C., 123-126. Agassiz, 41. Airy, 121, 123. Albedo, of dark star, 27. of Mercury, 62, 73-75. of Venus, 73-75. of Moon, 75. of Jupiter, 104, 105. of Saturn, 109. of Uranus, 116. of Neptune, 168. of clouds, 195. Algol, 3. American Academy, 125. Amphibians, first record of, 188. Anderson, Dr. Thomas D., 8, 12. André, 265. Andromeda, great nebula in, 10, 20, 21. constitution disclosed by spectroscope, 45, 48. Apex of Sun's way, 26. Arago, 121. Asteroids, 39, 60, 61, 94-102. domain of, 94. diminutive size, 94, 101. number, 94, 101. peculiar discovery of, 95-98. never formed part of a pristine whole, 98. where thickest, 98. formation of large planet from, prevented, 98, 99. mid-course between planets and comets, 100. shape of, 101, 102. mammoth meteorites, 102. mark transition between inner and outer planets, 102. Atmosphere, spectrographic study of, 53, 54, 161. Mercury deprived of, 71, 75, 232. reflecting power, 75. of Venus, 75. Moon deprived of, 75, 232. thin on Mars, 75, 91, 232. of Uranus, enormous, 117, 118, 232. of Neptune, vast, 118, 232. of Jupiter, 166, 232. depletion of, 231-233. none on Ganymede, 232, 233. of Saturn, 232. lacking in Saturn's rings, 232. Avogadro, 228. Axes of planets, systematic righting of, 132. tilts accounted for, 146.

B Babinet, 147. Backland, 68. Ball, Sir Robert, 145. Barrande, M., 178. Belopolski, 87. Bessel, 120, 121. Blandet, M., 175, 176. Bode, 95, 119. Bode's law, 96, 100, 119, 122, 126. Bolometer, 194. Bolton, Mr. Scriven, 103, 105, 106. Boltzmann, 228. Bose, 157. Bouvard, Alexis, 120, 121. Boyle, 228. Bradley, 68.

C Cambrian era, 178. Cambridge Observatory, 123. Campbell, 9. 255