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. Carboniferous period, 179. Cassini, 76, 162. Celestial mechanics, 28, 94, 155. Ceres, 101. Challis, 123. Chemistry, indebted to the stars, 160. Clausius, 228. Clerke, Miss, 9, 164. Climate, advent of, 185. Clouds, none on Venus, 75. of Jupiter not ordered as ours, 107, 163, 167. Uranus wrapped in, 168. Neptune wrapped in, 168. Earth once wrapped in, 170, 171, 178. Collision of dark star with Sun, 25, 215. warning of, 26-29. disturbances previous to, 29, 30. rarity of event, 30. Collisions between meteorites of a flock, 11, 49. causing light, 49, 50. Columbus, 188. Comets, 33, 61. members of solar system, 34, 35. orbits of, 61, 100. Commensurability of orbital period, 99, 111. Congruities of solar system, 128-137. deviations from, 62, 100, 101, 130, 131, 141. specify mode of evolution, 137. Convection currents, 219. in atmosphere of Venus, 80. Copeland, Dr. 7. Copernican system, 58. Copernicus, 62. Cosmic action, 1, 22, 184. Croll, 196. Cuticle of star, effect of impact on, 11.