What his hearers thought of this discourse I do not remember, but I have heard that the sun rose again the next morning. INDEX. Abbe, Professor, 56. Actinism, 71. Adams, Professor, 195. Africa, 116. Ages, stellar, 238. Air: dancing, 17; a medium, 33; continuous, 176; rarefied, 179; motes, 181; nimble, 191. (See _Atmosphere_.) Airless Mountains, 160. Air-wave, 185. Aitken’s Researches, 181. Alaska, 38. Aldebaran, 222, 235, 236, 246. Algot, 228. Allegheny Observatory, 17, 19, 84, 86. (See _Langley_.) Alphonsus Ring-plain, 156. Alps, 39, 148, 151, 167, 181. (See _Apennines, Lunar_.) American Astronomers, 227. American Continents, 20, 21, 31. (See _South_.) Andalusia, 53. Animalculæ, 224. Animals: food, 74; fright, 42. (See _Dog_.) Antares, 238. Ants, 223. (See _Insects_.) Apennines, 151, 153, 155, 160, 167. (See _Alps, Lunar_.) Apples, 171. Arab Traditions, 194. (See _Moslem_.) Arago, quoted, 41, 42. Archimedes, 94. Archimedes Crater, 151–153, 155. Arctic Cold, 159. Arctic Pole, 96. Arcturus, 208, 211. Aristillus Crater, 151. Aristotelian Philosophy, 8. Arzachel, 156, 161. Asteroids, 128. Astrology, 127. Astronomers and Priests, 1–3. (See _American, New_, _Old_.) Astronomical Day, 85, 86. Atmosphere, 136, 180; as a shield, 216, 220. (See _Air_.) Atolls, 152. Auger, simile, 31. Aurora Borealis, 35, 67, 212. Autolycus Crater, 151. Axis, 9, 10. Babel, 96. Bain Telegraph, 88. Balloons, 176. Bees, 124. (See _Insects_.) Berkeley’s Theory, 70. Berlin Observatory, 233. Bernières’s Lens, 103. Bessemer Steel, 104–108. Birds, 172, 196, 197. (See _Animals_.) Black Hole, 73. Bond, Professor, 204. Boston, Mass., 88, 132. Bothkamp, observations at, 66. Breadstuffs, 78, 79. (See _Grain_, _Sun-spots_, _Wheat_.) Bridges, 20, 68. Britain, Ancient, 1, 234. (See _England_.) British Isles, 14, 25. Brocken Spectre, 55. Brothers, Mr., 50. Bubbles, 168. Buffer, the air as a, 216, 220. Bunsen’s Researches, 12. Burnham, W. S., 233. Burning-glasses, 102–104. Burning Heat, 160, 163. Cactus, 14, 24. Calcutta, 73. California, 151, 180. Cambric Needle (_q. v._), experiment, 132. Cambridge Observations, 227, 245–247. Camera Obscura, 63. Campanus Crater, 163, 165. Candle, simile, 39. Cannon-ball, 5, 38, 41, 98, 135, 186, 211. Canopus, 234. Carbon, 72, 73, 107, 221. Carbonic-acid Gas, 219. Carpenter’s Studio, 140. Carrington’s Work, 79, 87. Carthage, 116. Cassini, 42. Cassiopeia, 229. Cataclysm, 30. Centimetres, 93. Chacornac’s Drawing, 33. Chambers, on sun-spots, 80. Charleston Earthquake (_q. v._), 42. Chemical Elements, 221, 223. Cherry-stone, comparison, 196.