Hartwig, Discovers a new Star in Andromeda, 315. Heights of Fireballs, 268; of Meteors, 277. Heis, His labours in Meteoric astronomy, 262. Hencke, Discoverer of Planetoids, 167. Henry, Bros., make a 30-inch refractor, 18; Performance of, 27. —— observe the belts on Uranus, 218. Herschel, Prof. A. S., observes meteors, 262. Herschel, Sir J., Comet of 1861, 233. ——, Description of k Crucis, 318. ——, Disappearance of Saturn’s ring, 205. ——, Rediscovers Uranus, 219. ——, Satellites of Uranus, 220, ——, Texture of Comets, 229. ——, Thickness of Saturn’s ring, 205. ——, Trapezium of Orion, 318, 320. Herschel, Sir W., and Cometary discovery, 231. ——, His discovery of Nebulæ, 327. ——, His discovery of nebulous Stars, 330. ——, His discovery of Uranus, 215; of Satellites, 220. ——, His method of observing Sun-spots, 91. ——, His observations of Jupiter, 182. ——, His observations of Mercury, 142. ——, His observations of Saturn, 199. ——, His observations of Venus, 149. ——, Nucleus of Comet of 1811, 232. —— observes Binary Stars, 300, 306. ——, Performance of 4-ft. reflector, 21. ——, Remarks on eyepieces, 47. ——, Rotation of Jupiter’s Satellites, 189. ——, Singular figure of Saturn, 196. Herschel’s, Sir W., Telescopes, 12, 13, 39. Hevelius, diameter of his object-glasses, 9. Hind, Discoverer of a new Star in 1848, 314. ——, Discoverer of Planetoids, 167. ——, Discoverer of a variable Nebula, 328. Hipparchus forms a Star-catalogue, 312. Hoek on the origin of Comets, 243. Hooke’s observations of Jupiter, 172. Hough’s observations of Jupiter, 174, 182. Howlett’s observations of Sun-spots, 101, 102. Huygens on the invention of the Telescope, 2. ——, Discoveries on Saturn, 8, 198. ——, Length of his instruments, 8. Huygens’s Negative eyepiece, 8, 46. Hyginus, The rill or cleft of, 130. Hyperbola, 230. Identity of Meteors and Comets, 262. Increasing number of Telescopes, 57. Intra-Mercurial Planet, 137. Jansen, Zachariah, Inventor of the Telescope, 4. Johnson’s projections of Solar Eclipses, 99. Juno, 168.