Prism binoculars for viewing moon, 122. Proclus, 68. remarkable brilliance of, 90. Projectile force on moon, 37. Promontorium Ænarium, 189. Promontory Acherusia, 224. Promontory Heraclides, 109. Promontory Laplace, 109. Ptolemæus, 98. Pytheas, 216. Rabbi Levi, 202. Reinhold, 217. Riccioli, nomenclature of, for lunar objects, 69. Rings, ranges of, on moon, 97-98. Riphæan Mountains, 190. Rotation of moon “braked” by tides, 20. Rotation of moon, illustrated, 19-20. Sacrobosco, 206. Schickard, 115. Schmidt, observation of Linné by, 233. Schröter, “lunar city” discovered by, 218. “Seas,” lunar, character of beds of, 142. Shadow of moon during eclipse, 40. length of, 40. Shadows on moon, topography revealed by, 100-101. used to measure heights on moon, 63. Sidereal revolution of moon, 11. _Sinus Æstuum_, 103. _Sinus Iridum_, 109. _Sinus Medii_, 103. _Sinus Roris_, 159. Size of moon, 8. Sky as seen from moon, 29. Snow, can it exist on the moon? 69. Snow, non-existence of, on moon, 69. South polar region of moon, 77. South pole of moon, 106. Stadius, 218. Stöfler, 75. row of rings near, 204. “Straight wall,” 187. Strait between Apennines and Caucasus, 234. Sulpicius Gallus, 222. Sunrise, slow progress of, on moon, 94. Sunshine, effects of, when vertical on moon, 100. Surface of moon, nature of, 9. size of, 9. Synodic revolution of, 11-12. Tacitus, 200. Telescopic power, limits of, 120. Teneriffe Mountains, 231. “Terminator,” meaning of, 63. Theætetus, 225. Theophilus, 71, 138, 198, 206. crater pits near, 211. grandeur of appearance of, when highly magnified, 207. great mountain fold near, 207-208. what would be seen from wall of, near sunset, 208. Tidal attraction, forcing moon away in reaction of, 6. “Tidal friction,” 20. Tides, causing of, by moon and sun, 21. effect of earth’s rotation on, 25. service rendered by, 22. simultaneous occurrence of, on opposite sides of earth, 23. when highest, 21. when lowest, 22. Twilight, why none on moon, 64. Tycho, 10, 98, 106, 146, 191. longest ray of, 93, 221. ray system of, 124. rays of, 99. theory of Nasmyth, 124-125. theory of Pickering, 126. Vegetation on moon, 32, 115, 142, 144, 227. Vendelinus, 59, 123. Venus seen by daylight, 149. Verne, Jules, “Trip to the Moon,” 4. Volcanic craters on moon, 60. Volcanoes, lunar, 54. contrasted with those of earth, 84. effects of gravitation on size of, 86. Water on the moon, 53. “Weathering” on the moon, 197. Weight on the moon, 36. Werner, 78, 205. Wilhelm I., 102, 195. Zagut, 202. ------------------------------------------------------------------------ =BOOKS BY GARRETT P. SERVISS.= =Other Worlds.=