498 



INDEX. 



Soconusco, the great volcano of, 

 277. 



Soffioni,the, of Tuscany, 211. 



Soil, frozen, in Northern Asia, 42 ; 

 its geographical extension, 47. 



Solfatara, the term inapplicable 

 to the crater of Kilauea, 392. 



Solo islands, character of the, 378. 



Solomon's islands. See Sesarga. 



Soufriere de la Guadeloupe, the, 

 described, 423. 



South Pacific Ocean, great num- 

 ber of volcanoes of the, 431. 



South Sea, volcanoes of the, 388 ; 

 its islands incorrectly described 

 as scattered, 389 ; the term 

 "Grand Ocean" objected to, 

 404. 



Southern Asia, volcanoes of the 

 islands of, 377. 



Spain, extinct volcanoes of, 

 433. 



Spartacus and his gladiators, their 

 encampment on Vesuvius, 427. 



Special results of observation in 

 the domain of telluric pheno- 

 mena, 1. 



Springs, rise of temperature in, 

 during earthquakes, 175 ; diffi- 

 culty of classifying into hot and 

 cold, 185 ; method proposed, 

 185 ; considerations on tempe- 

 rature, 187; heights at which 

 they are found, 190; boiling 

 springs rare, 197; the Geysirs 

 and Strokkr, 198; gases, 201; 

 Hallmann's classification, 205 ; 

 vapour and gas springs, salses, 

 207. 



Stokes, on the density of the 

 earth, vii. 



Stone streams distinguished from 

 lava streams, 306. 



Strabo, on the figure of the earth, 

 27 ; on lava, 226 ; on a double 

 mode of production of islands, 

 265. 



Strokkr, the, of Iceland, described, 

 199. 



Stromboli, description of, 256; 



periods of its greatest activity 

 257. 



Strongyle, described by Polybius, 

 257. 



Strzelecki, Count, on the basin of 

 Kilauea, 393. 



Styx, the waters of, 203 ; visits to 

 their source, 203. 



Submarine volcano, presumed, in 

 the Atlantic Ocean, 353 ; one 

 observed in the Pacific near 

 Chiloe, 288. 



Subterranean noises, 178 ; at- 

 tempts to determine the rate of 

 their transmission, 179. 



Sulphur Island, described by Cap- 

 tain Basil Hall, 377. 



Sulphuretted hydrogen, question 

 as to its existence in certain 

 fumaroles, 425. 



Sumatra, the Giava Minore of 

 Marco Polo, 379. 



Sumbava, violent eruption of the 

 volcano of, 381. 



Sun, magnetism of the, 85. 



Sunda islands, volcanoes of the, 

 380, 381. 



Swalahos, Mount, an extinct vol- 

 cano, 417. 



Taal, active volcano of, its sin- 

 gular position, 243; small ele- 

 vation, 244. 



Table-land of South America, of 

 Mexico, and Thibet, 406; list 

 of elevations, 408. 



Tacora, Volcan de, 286. 



Tafua, the peak of, 398. 



Tahiti, the geology of, recom- 

 mended for investigation, 399. 



Tajamulco, the volcano of, 277. 



Taman, mud volcanoes of the pen- 

 insula of, 217. 



Taranaki, a volcano in New Zea- 

 land, 397. 



Taurus, elongated, theThian-schan, 

 inchiding the Himalayas, known 

 as the, to the Greeks, 434. 



Tazenat, Gouffre de, an extinct 

 yolcano, 238. 



