Draco, planetary nebula in, 335. Drawing, 73. Drawings of Jupiter, 185. Dumb-bell Nebula (M. 27), 337. Duration of meteor-flights, 282. Duration of Silver-on-glass films, 60. Dynamometer, Berthon’s, 50. Early observations of Jupiter, 172. —— —— of nebulæ and star-clusters, 326. —— —— of Neptune, 222. —— —— of Saturn, 197. —— —— of the Sun, 88. —— —— of Uranus, 216. —— —— of Venus, 147. Earthshine on the Moon, 116. Eccentric position of Saturn’s rings, 204. Eclipses of Jupiter’s satellites, 189. —— of the Moon, 118. —— of the Sun, 97. Elger’s lunar observations, 127, 131. —— Drawings of lunar objects, 129, 130, 132. Ellipse, 230. —— on Jupiter, Gledhill’s, 173. Elliptical nebulæ, 338. Elongations of Mercury, 138. —— of Venus, 145. Encke’s Comet, 236. —— division in Saturn’s ring, 202, 208. English weather and Comet-seeking, 251. Equatoreal spots on Jupiter, Bright, 175, 181. —— ——, Dark, 181. Equatoreals, Advantage of, 54. Exceptional position of Sun-spots, 111. Eyepiece, Field of, 50. Eyepieces, 46. ——, Single-lens, 47. Fabricius observes Sun-spots, 89. Faculæ, Sudden outburst of, 108. Faint objects, Observation of, 72. Faintness of the markings on Venus, 150. Falls of stone and iron, 266. Faye’s Comet, 240. Field of eyepiece, Diameter of, 50. Figures, The Constellation, 290. Fireball of Nov. 23, 1877, 267. Fireballs, 267. ——, Heights of, 268. First view of Mercury, Amateur’s, 139. Formations, Lunar, 123. Foucault parabolizes and silvers glass Speculæ, 15. Fracastor, His remarks on lenses in 1538, 4. Friendly Indulgences, 74. Future, Past and, 84. Future eclipses of the Moon, 118. —— —— of the Sun, 98. Galaxy, or Milky Way, The, 295. Galilei and the invention of the Telescope, 2, 4, 5. ——, Discovery of Jupiter’s satellites, 187. ——, His first instrument and discoveries, 6, 7. Galle observes Saturn’s crape-ring, 202. —— observes Neptune, 222. Geminids, 276. Glass, Opera, 61. Gledhill’s ellipse on Jupiter, 173. Globe, Celestial, 63. Globular clusters. 338. —— ——, List of, 344. Gore, Diameter of α Centauri, 299. ——, Dimensions of a Star-cluster, 332. ——, Stellar distribution, 294. Greek alphabet, 287. Gregory invents a reflecting-Telescope, 10. Grimaldi, 129. Grouping of periodical Comets, 241. Groups of Stars, 316. Grubb, Maker of a 4-foot Cassegrainian reflector, 14; Performance of, 25. ——, Maker of a 27-inch refractor, 18; Performance of, 27. Hall, Chester More, invents achromatic Object-glass, 11. Hall, Prof., discovers a white spot on Saturn, 199. ——, Observations of Saturn’s satellites, 213. —— on the great Washington refractor, 26. ——, Remarks on large and small telescopes, 31. Halley’s Comet, 236. —— list of Nebulæ in 1716, 326. Harriot, Early observer of Sun-spots, 89, 90.