Rossfcll,M.de,his magnetic oscil'ation- 

 experiments, and their date of pub- 

 lication, 179 181. 



Rothmann, confounded the setting Zo- 

 diacal light with the cessation of 

 twilight, 132. 



Rozier, observation of a steady lumi- 

 nous appearance in the clouds, 197. 



lliimker, Encke's comet, 92. 



Riippell, denies the existence of active 

 volcanoes in Kordofan, 244. 



Sabine, Edward, observations on days 

 of unusual magnetic disturbance, 

 171; recent magnetic observations, 

 177, 178, 180, 181. 



Sagra, Ramon de la, observations on 

 the mean annual quantity of rain in 

 the Havannah, 341. 



Saint Pierre. Beruardin de, Paul and 

 Virginia, 4 ; Studies of Nature, 356. 



Salses or mud volcanoes, 221 224; 

 striking phenomena attending their 

 origin, 221, 222. 



Salt works, depth of, 148 150; tem- 

 perature, 166. 



Santorino, the most important of the 

 islands of eruption, 240, 241; de- 

 scription of. See note by Trans- 

 lator, 240. 



Sargasso sea, its situation, 313. 



Satellites revolving round the primary 

 planets, their diameter, distance, ro- 

 tation, fee., 78, 84; Saturn's, 81, 82, 

 115; Earth's, see Moon, Jupiter's 

 81,82; Uranus, 81,83. 



Saurians flying, fossil remains of, 

 276278. 



Saussure, measurements of the mar- 

 ginal ledge of the crater of Mount 

 Vesuvius, 280; traces of ammoniacal 

 vapours in the atmosphere, 317; hy- 

 grometric measurements with Hum- 

 boldt, 342344. 



Schayer, microscopic organisms in the 

 ocean, 351. 



Scheerer, on the identity of eleolite 

 and nspheline, 253. 



Schelling, on nature, 36; quotation 

 from his Giardino Bruno, 60. 



Scheuchzner's fossil salamander, con- 

 jectured to be an antidiluvian man 

 276, 277. 



Schiller, quotation from 3 1C. 



Schnurroi, on the obscuration of the 

 sun's disc, 121. 



Schouten, Cornelius, in 1616 found 

 the declination null, in the Paciiic, 

 176. 



Schow, distribution of the quantify <>;' 

 rain in Central Europe, 341. 



Sclirieber.on the fragmentary character 

 of meteoric stones, 104. 



Scientific researches, their frequent re- 

 sult, 31 ; scientific knowledge a re- 

 quirement of the present age, 33, 34; 

 scientific terms, their vagueness and 

 misapplication, 39, 50. 



Scina, Abbate, earthquakes uncon- 

 nected with the state of the weather, 

 201, 202. 



Scoresby, rarity of electric explosions 

 in high northern regions, 345. 



Sea. See Ocean. 



Seismometer, the, 200. 



Seleucus, of Erythrea, his astronomical 

 studies, 47. 



Seneca, noticed the direction of the 

 tails of comets, 87 ; his views on the 

 nature and paths of comets, 89; 

 omens drawn from their sudden 

 appearance, 97; the germs of later 

 observations on earthquakes found 

 in his writings, 202; problematical 

 extinction and sinking of Mount 

 jEtna, 225, 238. 



Shoals, atmospheric indications of their 

 vicinity, 314. 



Sidereal systems, 72 74. 



Siljerstrom, his observations on the 

 aurora, with Lottin and Bravais, on 

 the coast of Lapland, 190. 



Sirowatskoi, ' Wood Hills ' in New 

 Siberia, 284. 



Snow, line, of the Himalayas, 9 12, 

 338340; of the Andes, 337, 338; 

 redness of long fallen snow, 353. 



Solar system, general description, 74 

 145; its position in space, 72, 73; 

 its translatory motion, 134 140. 



Solinus, on mud volcanoes, 222. 



Sommering, on the fossil remains of the 

 large vertebrata, 276. 



Somerville, Mrs., on the volume of fire- 

 balls and shooting stars, 103; faint- 

 ness of light of planetary Nebular, 

 130. 



Southern celestial hemisphere, its pic- 

 turesque beauty, 69. 



c2 



