INDEX. CXXXV 



Schnurrer attributed some remarkable obscurations of the solar light to the pas- 

 sage of aerolites, p. 123. 



Schouten (Cornelius) observed the magnetic declination in 1616 in the Pacific 

 Ocean, Note 152. 



Schouw, on the fall of rain in the different seasons of the year, Note 405. 



Schreibers, fragmentary character of aerolites, p. 110. 



Schwann, on organic development. Note 431. 



Scina (Abbate), earthquakes unconnected with previous meteorological circum- 

 stances, Note 184. 



Scoresby, rare occurrence of thunder in the high northern latitudes, p. 336. 



Sea, see Ocean. 



Sefstrom, on crystals of olivine found in the scoriae of artificial works, Note 293. 



Seneca, remarked the usual direction of the tails of comets in reference to the 

 sun, Note 45. Aware of the cosmical nature and long orbits of comets, 

 Note 48. Remarked that stars are seen through the tails of comets, Note 49. 

 On the supposed ominous character of comets, Note 57. Speculations on the 

 causes of earthquakes, Note 184. Inclined to believe that Etna was becoming 

 extinct, p. 215 ; Note 214. On volcanic action and on the supposed lowering 

 of Etna, p. 229 ; Note 228. 



Shoals, their presence indicated by a diminished temperature of the sea, by mists, 

 and by clouds, p. 302. 



Sidereal systems, p. 7981, 141 ; Notes 34, 112. 



Siljerstrom, on the height of auroras, p. 181 ; Note 172. 



Sirowatskoi's discovery of the Wood-hills in New Siberia, Note 327. 



Snow, limit of perpetual, p. 10, 11, 326330; Notes 5, 400403. Forms of 

 organic life in polar and mountain snows, p. 344. Red snow, 344. 



Social plants, p. 6, 345, 346. 



Solar system, general account of, p. 81 134; Notes 35 100. Its place in space 

 inferred from a kind of stellar scale, p. 80. Its proper motion, or movement 

 of translation, p. 134, 135, 138;. Notes 101105. 



Solinus, on mud volcanoes, or " fluid earth issuing from the earth," Note 210. 



Somerville (Mrs.), on the comparative volumes of the small planets and the largest 

 aerolites, Note 62. On the volume and the light of planetary nebulae, Note 

 95. 



Sommering, on the fossil remains of the larger vertebrated animals, p. 261. 



Springs, cold and hot, general account of, p. 207211 ; Notes 202209. Causes 

 which influence the temperature of ordinary cold, p. 207, 208 ; Note 202, 203. 

 Deepest Artesian wells the warmest, p. 21 1 . Constancy to the same spot, 

 p. 210; Note 206. Formed from volcanic steam, p. 225. Thermal, p. 208 

 211 ; Notes 205, 206, 209. Connection with earthquakes and volcanic phaeno- 

 mena, p. 197, 210. Beds of travertin deposited from cold and warm, p. 237c, 



Stars, (fixed stars) p. 7781, 134145. Nebulous, p. 75, 76, 130, 143. Telescopi. 

 p. 143. Vast multitude in the Milky Way, p. 140. Double and multiple, 

 p. 20, 136138. Parallax and distance, p. 137, 138, 144 ; Notes 34, 106. Ap- 

 parent diameter and computed volume and mass, p. 137, 138. Proper motions, 

 p. 134140. Successive propagation of the light of, p. 143145; Note 121. 

 Appearance of new, and changes of brightness of previously known, p. 144, 

 145; Note 120. 



Sternberg (Count), fossil cycadeae in an old carboniferous formation, Note 320. 

 Strabo, conjectured an unknown land to exist between Iberia and Thinae, in the 

 46th parallel of latitude, p. 281 Extolled the varied configuration of Europe 



