INDEX. 



373 



at the South Pole, 187; important re- 

 sults of the Antarctic magnetic expedi- 

 tion in 1839, 192 ; rarity of electric ex- 

 plosions in high northern regions. 337. 



Rossell, M. de, his magnetic oscillation 

 experiments, and their date of pubU- 

 cation, 186, 187. 



/tothmann, confounded the setting zodi- 

 acal hght with the cessation of twilight, 

 143. 



JLozier, observation of a steady luminous 

 appearance in the clouds, 202. 



Rijmker, Encke's comet, 106. 



iliippell denies the existence of active 

 volcanoes in Kordofan, 245. 



'■abine, Edward, observations on days of 

 unusual magnetic disturbance, 178 ; re- 

 cent magnetic observations, 184, 185, 

 187, 188. 

 'agra, Ramon de la, observations on the 

 mean annual quantity of rain in the 

 Havana, 333. 



feint Pierre, Bernardin de, Paul and Vir- 

 ginia, 26 ; Studies of Nature, 347. 



lalses or mud volcanoes, 224-228 ; strik- 

 ing phenomena attending their origin, 

 224, 225. 



^It- works, depth of, 158, 159 ; tempera- 

 ture, 174. 



lantorino, the most important of the isl- 

 ands of eruption, 241, 242; description 

 of. See note by Translator, 241. 



sargasso Sea, its situation, 308. 



Satellites revolving round the primary 

 planets, their diameter, distance, rota- 

 tion, &c., 94, 99 ; Saturn's, 96-98, 127 ; 

 Earth's, see Moon, Jupiter's, 96, 97 ; 

 Uranus, 96-98. 



Saurians, flying, fossil remains of, 274, 

 275. 



Saussure, measurements of the marginal 

 ledge of the crater of Mount Vesuvius, 

 2.32 ; traces of ammoniacal vapors in 

 the atmosphere, 311 ; hygrometric 

 measurements with Humboldt, 334-336. 



Schayer, microscopic organisms in the 

 ocean, 342, 343. 



Scheerer on the identity of eleolite and 

 nepheline, 253. 



Schelling on nature, 55 ; quotation from 

 his Giordino Bruno, 77. 



Scheuchzner's fossil salamander, conjec- 

 tured to be an antediluvian man, 274. 



Schiller, quotation from, 36. 



Schnurrer on the obscuration of the sun's 

 disk, 133. 



Schouten, Cornelius, in 1616 found the 

 declination null in the Pacific, 182. 



Schouw, distribution of the quantity of 

 rain in Central Europe, 333. 



Schrieber on the fragmentary character 

 of meteoric stones, 117. 



Scientific researches, their frequent re- 

 sult, 50 ; scientific knowledge a require- 

 ment of the present age, 53, 54 ; scien- 

 tific terms, their vagueness and misap- 

 plication, 58, 68. 



Scina, Abbate, earthquakes unconnected 

 with the state of the weather, 206, 207. 



Scoresby, rarity 3f electric explosions in 

 high northern regions, 337. 



Sea. See Ocean. 



Seismometer, the, 205. 



Seleucus of Erythrea, his astronomical 

 studies, 65. 



Seneca, noticed the direction of the tails 

 of comets, 102 ; his views on the nature 

 and paths of comets, 103, 104 ; omens 

 drawn from their sudden appearance, 

 111 ; the germs of later observations on 

 earthquakes found in his writings, 207 ; 

 problematical extinction and sinking of 

 Mount .(Etna, 227, 240. 



Shoals, atmospheric indications of their 

 vicinity, 309. 



Sidereal systems, 89, 90. 



Siljerstrom, his observations on the Au- 

 rora, with Lottin and Bravais, on the 

 coast of Lapland, 195. 



Sirowatskoi, " Wood Hills" in New Sibe- 

 ria, 281. 



Snow-line of the Himalayas, 30-33, 331, 

 332 ; of the Andes, 330 ; redness of long- 

 fallen snow, 344. 



Solar system, general description, 90-154 ; 

 its position in space, 89 ; its translatory 

 motion, 145-150. 



Solinus on mud volcanoes, 225. 



Sommering on the fossil remains of the 

 large vertebrata, 274. 



Somerville, Mrs., on the volume of fire- 

 balls and shooting stars, 116 ; faintness 

 of light of planetary nebulae, 141. 



Southern celestial hemisphere, its pictur- 

 esque beauty, 85, 86. 



Spontaneous generation, 345, 346. 



Springs, hot and cold, 219-225 ; intermit- 

 tent, 219 ; causes of their temperature, 

 220-222; thermal, 222, 345; deepest 

 Artesian wells the warmest, observed 

 by Arago, 223 ; salses, 224-226 ; influ- 

 ence of earthquake shocks on hot 

 springs, 210, 222-224. 



Stars, general account of, 85-90; fixed, 

 89. 90, 104; double and multiple. 89, 

 147; nebulous, 85, 86. 151, 152; their 

 translatory motion, 147-150 ; parallaxes 

 and distances, 147-149 ; computations 

 of Bessel and Herschel on their diame- 

 ter and volume, 148 ; immense number 

 in the Milky Way, 150, 151 ; star dust, 

 85 ; star gaugings, 150 ; starless spaces, 

 150, 152 ; telescopic stars, 152 ; velocity 

 of the propagation of light of, 153, 154 ; 

 apparition of new stars, 153. 



Storms, magnetic and volcanic. See 

 Magnetism, Volcanoes. 



Strabo, observed the cessation of shocks 

 of earthquake on the eruption of lava, 

 215 ; on the mode in which islands are 

 formed, 227 ; description of the Hill of 

 Methone, 240; volcanic theory, 243; 

 divined the existence of a continent in 

 the northern hemisphere between The- 

 ria and Thine, 289 ; extolled the varied 

 form of our small continent as favorable 

 to the moral and intellectual develop- 

 ment of its people, 291, 292. 



Struve, Qtho, on the proper motion of the 



