232 



COSMOS 



Enceladus, a satellite of Saturn, 174. 

 Encke's Comet, elements, 197 ; its reap- 

 pearance, 198. 

 Epochs, main, of planetary discovery, 57. 

 Eccentricity of the planetary orbits, 127. 

 Exterior planets, 102. 



Fabricius first observes the solar spots, 64. 

 Facula3 and shallows, 86. 

 Ease's Comet, elements, 197. 

 FaUing stars, 204. 



Faraday on atmospheric maafnetism, 84. 

 Fire-balls, 193. 



Flora, discovery of, 101 ; elements, 163. 

 Fontaney, the Jesuit, on the Magellanic 

 Clouds, 47. 



Galileo, his controversy with Marius, 16 , 

 his Mundus Jovialis, 17 ; use of colored 

 glasses neglected by, 6.5. 



Geminus mentions nebulous stars, 15. 



Gnomons, ancient, 127. 



Halley's observations on nebuls, 19. 

 Halley's Comet, reappearances of, 186. 

 Heat, rays of, 83. 



Heat possessed by the Moon's light, 143. 

 Hebe, discovery of, 101; elements, 163. 

 Heis's observations on shooting stars, 212. 

 Herschel, Sir William, his estimate of the 

 extent of nebulous spots, 14; his dis- 

 coveries, 21; on the nebula of Orion, 

 40; on solar spots, 67; opposed to the 

 assumption of a lunar atmosphere, 147. 

 Herschel, Sir John, on nebulas and stellar 

 clusters, 27, 31 ; on irregular nebulous 

 masses, 35 ; on the nebula in Orion, 38 ; 

 on the nebula round tj Argus, 41 ; on 

 the nebula in Vulpes, 41 ; his descrip- 

 tion of the Magellanic Clouds, 47 ; on 

 the black specks and coal-bags of the 

 southern hemisphere, 51 ; on the heat 

 of the Moon's surface, 131. 

 Herschel, Miss, discovery of a nebula by, 



31. 

 riipparchus mentions nebulous stars, 15. 

 Houzeau's observations on the zodiacal 



light, 204. 

 Humboldt, Alexander von, works of, 

 quoted in various notes : 

 Asie Centrale, 222. 

 De Distributione Geosxaphica Plan- 



tarum, 123. 

 Esamen Critique de I'Histoire de la 

 Geographic du Nouveau Conti- 

 nent, 15, 28, 45, 151. 

 Kleinen Schriften, 114. 

 Voyage aux Rfegions Equinosiales, 



215. 

 Vues des Cordilleres et Monumens 

 des Peuples Indigenes de rAm6- 

 rique, 98. 

 Huygens discovers the nebula in the 



Bword of Orion, 19, 37. 

 Pygeia, discovery of, 101 ; elements, 163. 

 Hyperion, a satellite cf Saturn, 174. 



hitensity of the solar light on the planets, 



130. 

 Interior comets, 197. 



Interior planets, 103 

 Irene, discovery of, 101 ; elements, 163. 

 Iris, discovery of, 101 ; elements, 163. 

 Irregular nebulous masses, 33 ; situata 



near the Milky Way, 34 ; extraordinary 



size and singular forms, 36. 

 Isaac, Aben Sid Hassan, introduces thfl 



Latinized term nebulosse into the Al- 



phonsine Tables, 15. 

 Jacob, Captain, on the nebula round i| 



Argiis, 41. 

 Japetus, a satellite of Saturn, 174. 

 July, falling stars in, 214. 

 Juno, discovery of, 100 ; elements, 163. 

 Jupiter, numerical data, 165 •, streaks, or 



girdles, 167. 

 Jupiter's satellites, numerical data, 169. 



Kant's speculations on nebulae and star- 

 formation, 20. 



Kepler on planetary distances, 110 ; laws 

 of planetary motion discovered by, 229. 



Lacaille, his classification of nebulae, 19. 



Lambert's speculations on nebulae, 20. 



Lassell, discovery of a satellite of Saturn 

 bv, 174; of satellites of Neptune by, 

 180. 



Laurentius stream of failing stars, 214. 



Le Geutil's study of nebulae, 20. 



Leonardo da Vinci, Earth-light knovm to, 

 145. 



Leverrier and Adams, claims to the dis- 

 covery of Neptune, 179. 



Lexell's Comet, 191. 



Light, time required to traverse the radius 

 of the Earth's orbit, 60; solar and arti- 

 ficial, 82 ; difference of intensity in the 

 different planets, 130. 



Light, zodiacal. See Zodiacal light. 



Light-clouds, comets so styled by thn 

 Greeks, 181. 



Lucerna Mundi, the Sun, 59. 



Lunar atmosphere disproved, 147. 



Lunar spots, 149. 



Magellanic Clouds, early notices of, 15; 

 termed Cape-clouds by the Portu 

 guese, 43 ; general adoption of the 

 name, 46 ; described by Sir John Her- 

 schel, 48 ; not connected with one an- 

 other, 48 ; nor with the Milky Way, 48 



Magnitude, absolute and appai'ent, of 

 planets, 105. 

 I Map of the Moon, 151. 

 ' Mars, numerical data, 159 ; meteorologic- 

 al analogies with the Earth, 159. 



Masses of the planets, 118. 



May, falling stars in, 214. 



Mayer, of Gunzenhausen (Simon Marius) 

 first describes a nebula, 16. 



Mercury, distance, diameter, mass, densi 

 ty of, 137. 



Messier, his discoveries resarding nebu 



IcE, 21. 



Meteor asteroids, 57. 



Meteoric stones. 57 ; seldom fall from t 



clear sky, 219 ; remarkable falls of 



219 ; ana"lysis, 223. 

 Metis, discovery of, 101 ; elcmentji. 1C3 



