INDEX. 



461 



Seneca on volcanoes, 216. 



Seriarga, volcano of, 370. 



Shasty Mountains, basaltic lavas found in 

 the, 3S9. 



Siebengebirge, trachyte of the, 226; geo- 

 logical topography, 424. 



Siebold on the volcanoes of Japan, 349. 



Sierra Madre, erroneous notions regarding 

 the, 379, 383 ; east and west chains, 384. 



Silla Veluda, volcano of, 2T3. 



Silurian and Lower Silurian formations, 

 eruptive trap-masses of the, 329, 450. 



Silver in sea-water, its presence how mani- 

 fested, 411. 



Sitka or Baranow, 45, 255. 



Smyth, Captain, on the Columbretes, 329 ; 

 detennination 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, 367. 



Solo islands, character of the, 355. 



Solomon's islands. See Sesarga. 



Soufriere de la Guadeloupe, the, described, 

 395. 



South Pacific Ocean, great number of vol- 

 canoes of the, 403. * 



South Sea, volcanoes of the, 364; its isl 

 ands incon-ectly described as scattered 

 364; the tema "Gi'and Ocean" objected 

 to, 378. 



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 

 eartliquakes, 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 I'are, 189; 

 the Geyser and Strokkr, 190; gases, 

 193; Kallmann'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 

 4ava, 216; on a double mode of produc- 

 tion of islands, 252. 



Strokkr, the, of Iceland, described, 191. 



Sti-omboli, description of, 243; periods of 

 its greatest activity, 244. 



Strongyle, described by Polybius, 244. 



Strzelecki, Count, on tlie basin of Kilauea, 

 368. 



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 Island, described by Captain Basil 



Hall, 353. 

 Sulphureted hydrogen, question as to its 



existence in certain fumaroles, 397. 

 Sumatra, the Giava Minore of Marco Polo, 



355. 

 Sumbava, violent eruption of the volcano 



of, 357. 

 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 ; fcmall elevation, 233. 



Table-land of South America, of Mexico, 

 and Thibet, 380; 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 domj,in of, 5. 



Temboro, a volcano, its violent emption in 

 1815, 357. 



Temperature, invariable, stratum of, 41; 

 mean annual, how determined in the 

 tropics, 42; observations of, in Mexico 

 and Peru, by Humboldt, 46 ; frozen soil 

 in Northern Asia, 44; Schergin's shaft, 

 45. See Interior of the Earth. 



Temperature, rise of, in springs, during 

 eartliquakes, 169. 



Teneriffe, the feldspar of the trachytes of, 

 427 ; notice of an eruption on, by Colum- 



• bus, 444. 



Ternate, violent eruptions andlava streams 

 in, 357. 



Tertiaiy formations in Java, 281. 



Thermal springs, their connection with 

 earthquakes, 170. 



I'hian-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, 280. 



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

 cano, 368. 



Tollo, the paadce hill of, 448. 



Tonga Islanal^ 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 remai-ks, 437. 



Tractus chalyboeliticos, what, 60. 



Translatory movements in earthquakes, 

 167. 



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

 451. 



Trass fonnation, 225. 



Trincheras, hot springs of, 180. 



