Perrotin observes the belts on Uranus, 218. —— —— the canals on Mars, 27, 160. —— on work with a 30-inch refractor, 347. Perry on drawing Sun-spots, 93. —— observes veiled Sun-spots, 110. Persei β (Algol), 310. —— χ, 317. Perseids, 275. ——, Their shifting radiant-point, 283. Perseverance, 79. Petavius, 128. Peters, Discoverer of Planetoids, 167. Phase, Epochs of similar, 117. —— of Jupiter, 172. —— of Mars, 156. Phases of Mercury, 139. —— of Venus, 147. Phobos, Inner Satellite of Mars, 165. Photography, 82. Photometric measures of Starlight, 295. Physical aspects of Comets, 244. —— changes on the Moon, 120. Pickering on the canals of Mars, 348. Planetary bodies on the Sun, 105. —— conjunctions, 225. —— Nebula, 334. Planetoid, The 308th, 349. PLANETOIDS, Number of, 167. History of their discovery, 167. Occultation of Vesta, 167. Dimensions and brightness, 168. Plato, 125. Polaris, 308. Pons, Discoverer of many Comets, 250. Pons’s Comet of 1812, 241, 242, 245. Pons-Winnecke’s Comet, 240. Powers, Method of determining, 49. ——, Overstating, 49. ——, Requisite magnifying, 48. Præsepe, 317. Preparation of the observer, 66. Princeton refractor, Performance of, 26. Prizes for Cometary discoveries, 258. Proctor on Amateur observers, 163. —— on Sun-ejected Meteors, 349. Projection of satellites of Jupiter, 190. —— of Stars on the Moon, 135. Prominences, Solar, 111. Proper motion of spots on Jupiter, 173. —— —— of Stars, 299. —— —— of Sun-spots, 106. Publications, Astronomical, 83. Pulkowa, The 30-inch refractor at, 27. Quadrantids, 274. Radiation of Meteors, 262. Ramsden’s positive eyepiece, 47. Ranyard, Absorption of light by object-glasses, 37. Recording Meteor-tracks, 280. Records, 72. Recurrent disturbances on the Sun, 110. —— forms on the Sun, 111. Red spot on Jupiter, Appearance of, 173; Rotation of, 175; Nature of, 177. Refracting-lenses or burning-glasses, 3. Refracting-telescope, 12. Refractors and Reflectors, 39. Rheita, Valley near, 131. Rigel, 307. Ring nebula in Lyra, 337. —— of Neptune, Supposed, 223. —— of Saturn, Division in the outer, 201. —— ——, The Crape, 202. Rings of Saturn, 201. —— ——, Aspect of the, 204. —— ——, Eccentric position of the, 204. —— ——, Thickness, 205. Roberts’s photographs of the Nebula in Andromeda, 334, 351. —— —— of Nebulæ in Ursa Major, 338. Rosse, Lord, Large reflecting-telescopes, 14; Their performance, 21. Rotation of Comets, Visible evidences of, 246. —— of Jupiter, 176, 348. —— of Mars, 161, 348. —— of Mercury, 142. —— of Saturn, 199. —— of the Sun, 103. —— of Uranus, 217. —— of Venus, 149. Round Nebulæ and Clusters, 332. Safarik on Telescopic Meteors, 273. Saros, The, 99. Satellite of Neptune, 223.