JUPITER, 170. An interesting object, 170. Brightness and position, 170. Period &c., 171. Belts and spots, 172. Observations of Hooke, Cassini, and others, 172. The “Ellipse” of 1869-70, 173. The red spot, 173. Rotation of red spot, 175. Rotation of bright equatoreal spots, 175. Rotation of dark spots in N. hemisphere, 175. Rotation-period, 176. Nature of the red spot, 177. Bright equatoreal spots, 181. Dark equatoreal spots, 181. New belts, 182. Changes on the planet, 182. Further observations required, 183. Occultations by the Moon, 185. The four satellites, 187. Their eclipses, occultations, and transits, 189. The planet without visible satellites, 192. Spots on the Satellites, 193. Occultation of a Star by Jupiter, 193. Keeler, White spots and canals on Mars, 348. Kitchiner, The inutility of large Telescopes, 35. ——, Singular form of Saturn, 196. Klein’s supposed new crater near Hyginus, 122. Large and small telescopes compared, 20. —— Comets, 231. —— number of Comets, 228. —— refractor intended for California, 36, 347. Lassell, His large reflecting-telescopes, 14; Their performance, 24. —— discovers the satellite of Neptune, 224. —— glimpses a belt on Uranus, 217. Leander McCormick refractor, 26. Learning the names of the Stars, 287. Leibnitz mountains, 131. Le Mairean or Herschelian telescope, 13. Lenses, Cleaning, 59. —— out of centre, 55. Leonids, 276. Lescarbault rediscovers Saturn, 350. Le Verrier, Theoretical discoverer of Neptune, 222. Lick, James, Founder of the Lick Observatory, 18. Lick refractor, Performance of the, 27. Light of Comets, Fluctuating, 245. Limited means no obstacle, 51. Lippersheim, Hans, Inventor of the telescope, 4, 5. Lunar changes, 120. —— formations, 123. Lyræ α, 308. Lyrids, 275. Mädler’s observations of Lunar objects, 127, 131. —— —— of Mars, 158. —— —— of Venus, 149. Magellanic clouds, 331. Magnitudes of Stars, 294. Marius, Simon, observes Jupiter’s satellites, 6. —— observes Nebula in Andromeda, 326. Markings on Mercury, Surface-, 142. —— on Venus, 147. —— ——, Faintness of, 150. MARS, Appearance of, 155. Period &c., 155. Phase, 156. Surface-configuration, 156. Charts and nomenclature, 158. Discovery of satellites and canal-shaped markings, 159. Summary of observations, 160. Rotation, 161. Further observations required, 162. Changes on the Planet, 163. Satellites, 164. Occultations by the Moon, 166. Martin’s 4-foot reflector at Paris, 15; Its performance, 25. —— 29-inch refractor at Paris, 18. Maunder on Sun-spots, 93. Maxima and minima of Sun-spots, 100. Means of measurement, 290.