Atmospheres, how they may grow or decrease, 230. Azophi, 205. Barry, 189. “Bay of Rainbows,” 109, 111, 142, 157, 158. Bessel, 221. Bianchini, 110. Birt, 188. Blancanus, 78, 194. Bonpland, 189. Bubbles on the moon, 186. Bullialdus, 180-182, 183. mountains near, 183. Byrgius, 147. Calippus, 223. Campanus, 185. Capuanus, 185, 196. Carpathian Mountains, 215. Cassini, 225. Catharina, 72, 138, 199, 206. remarkable valleys near, 199-200. Caucasus Mountains, 97, 223. Caucasus and Apennines, strait between, 234. “Cavern life” on moon, 229. Cichus, 185, 196. Clavius, 99, 101, 146, 192. length of great wall of, 193. Cleft near shore of _Mare Nubium_, 186. Clefts on moon, resemblance of, to geological “faults,” 187. Cleomedes, 56. Color on moon, 155. Colorado Cañon, possible likeness of, to cleft on moon, 118. Copernicus, 102, 211. an argument for the volcanic theory, 212. buried ring near, 217-218. crater pits near, 213. hexagonal form of, 212. Craters, lunar, formation of, ascribed to falling masses, 201. theory of, advanced by W. K. Gilbert, 200. Cyrillus, 72, 138, 199, 206, 210. “Dark woman” in moon, 133. Darwin, Prof. George, 6. Dawes, 224. Day and night on moon, 63. Day on moon, length of, 95. Earth, light of, on moon, 50. shadow of, effects of, as shown by Prof. William H. Pickering, 28. shadow of, its size and length, 18. Eclipse, lunar, 17-18. earth’s atmosphere and, 27. moon visible during, 26. Eclipses, lunar, colors visible during, 29. fix historic dates, 29. number of, in year, 42. when annular, 41. Eclipses, why they do not occur every month, 38. solar, different from lunar, 27. number of, in year, 42. why of greater scientific value than lunar, 28. Endymion, 70, 132. Eratosthenes, 104. Eudoxus, 76, 138. Fracastorius, 73. Fra Mauro, 189. Full Moon in winter, why it runs high, 170. Furnerius, 63. Gases, escape of, from moon, 229. from planets, 33. molecular velocity of, 33, 229. Gassendi, 117. Gauricus, 196. Gay Lussac, 216. Gemma Frisius, 202. “Geology” of moon, 67. “Giantism” on the moon, 193. Gilbert, W. K., theory of lunar craters advanced by, 200. Gravitation on moon, 34-36. Grimaldi, 121, 132. Hæmus Mountains, 92, 220. Hansen, theory of, in regard to the other side of moon, 139. Harbinger Mountains, 118. “Harvest Moon,” 171. Heat of moon compared with that of sun, 164. Helen of Troy, 92. Hell, 196. Hercules, 70. Herodotus, 112, 158. cleft near, 118. Herschel, Sir William, his supposed discovery of active lunar volcano, 112. Hipparchus, 78. Hoar frost on moon, 34. “Hunter’s Moon,” 171. Inhabitants of moon, 31-32, 88, 95. would not be visible with most powerful telescope, 120. why they might be giants, 193. Kepler, 114, 141, 152. Kies, 185. _Lacus Somniorum_, 93, 219. Landsberg, 217. Langrenus, 56, 123, 132.