INDEX. 



4G1 



Seneca on volcanoes, 210. 



Sesarga, vol< B70. 



Shasty Mountains, basaltic lavas fount! in 



the, 889. 

 Siebengebirge, trachyte of the, 926] geo- 



logical topography, I- 1. 

 Siebold on ti>" volcanoes of Japan, ">I9. 

 i Madre, erroneous notions regarding 



the, 379, "' s :j ; east and vrest chains, :; s '■■ 

 Silla Velnda, volcano of, 273. 

 Silurian and Lower Silurian formations, 



eruptive trap-masses of the, 329, 450. 



Silver in sea-water, its presence how mani- 

 fested, 411. 



Sitka or Karanow, 45, 255. 



Smyth, Captain, on the Columbretes, 329 ; 

 determination of the height of ./Etna, 237. 



Society Islands, the geology of, recom- 

 mended for investigation, 373. 



Soconusco, the great volcano of, 263. 



Soffioni, the, of Tuscany, 202. 



Soil, frozen, in Northern Asia, 44; its ge- 

 ographical extension, 48. 



Solfatara, the term inapplicable to the cra- 

 ter of Kilauea, 307. 



Solo islands, character of the, 355. 



Solomon's islands. See Sesarga. 



Soufriere dc la Guadeloupe, the, described, 

 395. 



South Pacific Ocean, great number of vol- 

 canoes of the, 403. 



South Sea, volcanoes of the, 304; its isl- 

 ands incorrectly described as scattered, 

 364; the term "Grand Ocean" objected 

 to, 37S. 



Southern Asia, volcanoes of the islands of, 

 354. 



Spain, extinct volcanoes of, 404. 



Spartacus and his gladiators, their en- 

 campment on Vesuvius, 399. 



Special results of observation in the do 

 main of telluric phenomena, 5. 



Springs, rise of temperature in, during 

 earthquakes, 109 ; difficulty of classify- 

 ing into hot and cold, ITS ; method pro- 

 posed, 178; considerations on tempera- 

 ture, ISO; heights at which they are 

 found, 183; boiling springs rare, 1S9; 

 the Geyser and Strokkr, 190; gases, 

 193; Hallmann's classification, 196; va- 

 por and gas springs, salses, 19S. 



Stokes, on the density of the earth, 35. 



Stone streams distinguished from lava 

 streams, 289. 



Strabo, on the figure of the earth, 30 ; on 

 lava, 216 ; on a double mode of produc- 

 tion of islands, 252. 



Strokkr, the, of Iceland, described, 191. 



Stromboli, description of, 243; periods of 

 its greatest activity, 244. 



Strongyle, described by Polybius, 244. 



Strzeiecki, Count, on the basin of Kilauea, 

 36S. 



Styx, the waters of, 194; visits to their 

 source, 195. 



Submarine volcano, presumed, in the At- 

 lantic Ocean, 332 ; one observed in the 

 Pacific, near Chiloe, 272. 



Subterranean noises, 171 ; attempts to de- 

 termine the rate of their transmission, 

 172. 



Sulphur I land, described by Captain Basil 



Hail. 863. 

 Sulphurated hydrogen, question as to Its 



existence In certain lumaroles, 897. 

 Sumatra, the Giava Minore of .Marco Polo, 



356. 

 Sumbava, violent eruption of the volcano 



of, 367. 



Sun, magnetism of the, 84 

 Sunda islands, volcanoes of the, 356, 357. 

 Swalahos, .Mount, an extinct volcano, 390. 



Taal, active volcano of, its singular po- 

 sition, 232; small elevation, 233. 



Table-land of South America, of Mexico, 

 and Thibet, 3S0; list of elevations, 382. 



Tacora, Volcan de, 271. 



Tafua, the peak of, 373. 



Tahiti, the geology of, recommended for 

 investigation, 373. 



Tajamulco, the volcano of, 262. 



Taman, mud volcanoes of the peninsula of, 

 207. 



Taranaki, a volcano in New Zealand, 372. 



Taurus, elongated, the Thian-shan, includ- 

 ing the Himalayas, known as the, to the 

 Greeks, 405. 



Tazenat, Gouffre de, an extinct volcano, 

 227. 



Telica, Volcan de, described, 260. 



Telluric phenomena, special results of ob- 

 servation in the domain of, 5. 



Temboro, a volcano, its violent eruption in 

 1815, 357. 



Temperature, invariable, stratum of, 41; 

 mean annual, how determined in the 

 tropics, 42 ; observations of, in Mexico 

 and Peru, by Humboldt, 43 ; frozen soil 

 in Northern Asia, 44; Schergin's shaft, 

 45. See Interior of the Earth. 



Temperature, rise of, in springs, during 

 earthquakes, 169. 



Tenei iffe, the feldspar of the trachytes of, 

 427 ; notice of an eruption on, by Colum- 

 bus, 444. 



Ternate, violent eruptions andlava streams 

 in, 357. 



Tertiary formations in Java, 2S1. 



Thermal springs, their connection with 

 earthquakes, 170. 



Thian-schan, the volcanic mountain chain 

 of, 337 ; peculiarity of the position of the 

 volcano, 405; the chain known to the 

 Greeks as the elongated Taurus, 405. 



Thibet, hot springs of, 189 ; geyser, 191. 



Tierra del Fuego, volcanoes of, 2S0. 



Timor, Pic of, formerly an ever-active vol- 

 cano, 35S. 



Tollo, the pumice hill of, 44S. 



Tonga Islands, active volcanoes of the, 369. 



Toronto, magnetic observations at, 99. 



Trachyte, origin of the word, 421; fre- 

 quently used in too confined a sense, 

 422; farther remarks, 437. 



Tractus chalyboeliticos, what, 00. 



Translatory movements in earthquakes, 

 107. 



Trap, masses of, Sir E. Murchison on, 329, 

 451. 



Trass formation, 225. 



Trincheras, hot springs of, 189. 



