INDEX. 



461 



Seneca on volcanoes, 216. Sulphur Island, described by Captain Basil 



Sesarga, volcano of, 370. Hall, 353. 



Shasty Mountains, basaltic lavas found in Sulphureted hydrogen, question as to its 



the, 3S9. existence in certain fumaroles, 397. 



Siebengebirge, trachyte of the, 22G; geo- Sumatra, the Giava Minore of Marco Polo, 



logical topography, 424. 355. 



Siebold on the volcanoes of Japan, 349. Sumbava, violent eruption of the volcano 

 Sierra Madre, erroneous notions regarding of, 357. 



the, 379, 383 ; cast and west chains, 384. j Sun, magnetism of the, 84. 

 Silla Veluda, volcano of, 273. Sunda islands, volcanoes of the, 356, 357. 



Silurian and Lower Silurian formations, Swalahos, Mount, an extinct volcano, 390. 



eruptive trap-masses of the, 329, 450. 

 Silver in sea-water, its presence how rnani- Taal, ac live volcano of, its singular po- 



fested, 411. 



Sitka or Baranow, 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. 



sition. 232 ; tmall elevation, 233. 

 Table-land of South America, of Mexico, 



and Thibet, 3SO; 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, 



Solfatara, the term inapplicable to the era- Taranaki, a volcano in New Zealand. 372. 



terofKilauea, 367. ~- * " 



Solo islands, character of the, 355. 



Solomon's islands. See Sesarga. 

 Soufricre de la Guadeloupe, the, described, 

 395. 



Greeks, 405. 

 Tazenat, Gouffre de, an extinct volcano, 



South Pacific Ocean, great number of vol- Telica, Volcan de, described, 260. 



canoes of the, 403. 



South Sen, volcanoes of the, 364; its isl- 

 ands incorrectly described as scattered, 

 364; the term "Grand Ocean" objected 

 to, 378. 



Southern Asi .-., volcanoes of the islands of, 



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. 



earthquakes, 169 ; difficulty of classify 

 ing into hot and cold, 178 ; method pro- 

 posed, 178; considerations on tempera- 

 ture, 180; heights at which they are 

 found, 183; boiling springs rare, 189; 

 the Geyser and Strokkr, 190; gases, 

 193; Ilallmann's classification, 196 ; va- 

 por and gas springs, salses, 198. 



Stokes, on the density of the earth, 35. 



Stone streams distinguished from lava 

 streams, 289. 



Strabo, on the figure of the earth, 30; on Thibet, hot springs of, 189; geyser, 191. 



lava, 216; on a double mode of produc- Tierra del Fuego, volcanoes of, 280. 



tion of islands, 25' 

 Strokkr, the, of Iceland, described, 191. 



Stromboli, description of, 243 ; periods of 



its greatest activity, 244. 

 Strongyle, described by Polybius, 244. 

 Strzelecki, Count, on the basin of Kilauea, 



368. 

 Styx, the waters of, 194; visits to their 



source, 195. 



Pacific, near Chiloe, 272. 

 Subterranean noise?, 171; attempts to de- 



termine the rate of their transmission, Trass formation, 225. 



j.arauaK.1, a volcano in rsew /.eauinu, 0(2. 

 Taurus, elongated, the Thian-shan, includ- 

 ing the Himalayas, known as the, to the 



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. 



rise of temperature in, during Teneriffe, the feldspar of the trachytes of, 

 "- '"" " -" ' '* 427; notice of an eruption on, by Colum- 

 bus, 444. 

 Ternate, violent eruptions and lava streams 



in, 357. 



Tertiary formations in Java, 281. 



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. 



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

 cano, 358. 



Tollo, the pumice hill of, 448. 



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, 60. 



Submarine volcano, presumed, in the At- Translatory movements in earthquakes, 

 lantic Ocean, 332 ; one observed in the 



167. 



Trap, masses of, Sir R. Murchisoa on, 329, 

 451. 



172. 



iTrincheras, hot springs of, 189. 



