456 



ISJDEX- 



Fogo, volcano of the Ilha do, 249. 



Forbes, on the conductive power of differ- 

 ent rocks, 41. 



Formosa, the turning-point of the lines of 

 rolcanic elevation in the islands of East- 

 era Asia, 346; its volcanoes, 353. 



Foucault' s apparatus for demonstrating the 

 rotation of the earth, 28. 



France, extinct volcanoes of, 227, 263. 



Franklin on frozen earth in the northwest 

 of America, 60; his Arctic voyages, 65; 

 search for him, 65. 



Franklin's Bay, volcano of, more properly 

 a salse, 391. 



Fredonia, near Lake Erie, springs of in- 

 flammable gas at, 204. 



Fremont's hypsometrical investigations in 

 Northwest America, 383. 



Fremont's Peak, 3SS. 



French Alps, highest summit of the, 220. 



Frozen earth, its geographical extension, 

 48. 



Fse-nan, a Chinese magnetic apparatus, 

 52. 



Fuego, Volcan de, described, 



Fumaroles, various classes of, 396; Bun- 

 sen on their products, 396. 



Fummarole of the Tuscan Maremma, 202 



Fused interior of the earth, 234. 



Galapagos, the, countless cones and ex- 

 tinct craters, 374; pumice not found 

 there, 375. 



Galera Zamba, terrible eruptions of flames 

 and terrestrial changes at, 208. 



Gandavo, Fray Juan de, explores the era 

 ter of Masaya, 247. 



Gas, volcanic exhalations of, inquiry into, 

 412. See, also, Springs. 



Gauss, his theory of terrestrial magnetism, 

 63. 



G.ay-Lussac on the chemical causes of vol- 

 canic phenomena, 163 ; on waves of com- 

 motion and oscillation, 165. 



Gemellaro, his estimate of the height to 

 which erupted bodies ascend from 

 na, 251. 



Geographical distribution of volcanoes, 

 393; an abnormal phenomenon in, no- 

 ticed, 405. 



Geological terms, origin of some, 421. 



Geysers, the, of Iceland described, 191. 



Gilbert, William, lays down comprehen- 

 sive views on the magnetic force of the 

 earth, 58. 



Glassy feldspar. See Feldspar. 



Godivel, Lac de la, an extinct volcano, 

 227. 



Gog and Magog, Oriental myth of, 337. 



Gold, believed to be found in volcanoes, 

 248; descent into Masaya, in search of 

 ifc, 248. 



Graham, his observation of the hourly va 

 nations of the magnetic force, 61. 



Graham Island, temporary formation of 

 328. 



Grand Ocean, a term for the basin of the 

 South Sea, objected to, 378. 



Granite, Mitscherlich's experimen 

 melting point of, 234. 



Greece, has frequently suffered from earth 



qtmkes, 170; great numbed of thermal 



springs, 170. 



renelle, the Artesian Well of, 38. 

 Ground temperature, observations on, 183, 



See, also, Frozen Earth. 

 Guadeloupe, the Soufriore of, described, 



395. 



uagua-Pichincha, its meaning, 231. 

 Gualatieri, volcano of, 271. 

 Griianacaure, a volcano, 260. 

 xuanahuca (Guanegne ?) volcano of, 274. 

 xiiettard's observations on extinct volca- 



noes, 310, 

 Grimung, the Javanese term for mountain, 



282. 

 runung Tengger, a volcano in Java, vast 



size of its crater, 284. 

 3-uyot of ProVins, his mention of the mag- 



netic needle, 54. 



rlair glass, a volcanic product, 367. 



lall, Captain Basil, experiments to de- 



termine the mean temperature of places 



within the tropics, 42 ; measurement of 



the volcanoes of Old Guatemala, 262; 



his admirable description of Sulphur Isl- 



and, 353. 



lalley's theory of four magnetic poles, 59. 

 "lallmann, his classification of springs, 



196. 

 lansteen on the magnetism qtthe earth, 



66. 

 larton, pendulum experiments at, relative 



to the density of the earth, 35. 

 lawaii, the volcanoes of, described, 369. 

 leat, distribution of, in the interior of our 



globe, 37; hypothesis of the depth of the 



fused interior of the earth below the 



present sea-level, 234. 

 Hecla, the volcano, its aspect, 232; in- 



frequency of its eruptions, 243; how 



classified by Waltershausen, 330. 

 Selena, St., volcanic phenomena of, 331. 

 Helen's, St., Mount, a volcano, 390. 

 Hell, the cold, of the Buddhists, 189. 

 Hephaestos, Volcano, the holy isle of, 241. 

 Herefordshire, sedimentary rocks of, 221. 



Hesse, on the volcanoes of Central Ameri- 



ca, 258. 

 Hiera, volcanic phenomena upon, de- 



scribed by Aristotle, 219. 

 Himalayan chain, four highest mountains 



of the, 271 ; known to the Greeks as the 



elongated Taurus, 406. 

 Hobarton, magnetic observations at, 99. 

 Ho-cheu, a volcano, also called Turfan, 



335. 



Hood, Mount, an extinct volcano, 389. 

 Hooker, Joseph, on the hot springs of Mo- 



may, 891. 



Hopkins on earthquakes, 162, 165, 168. 

 Horary variation of the declination not 



ascribable to the heat of the sun, 81 ; 



maxima and minima, at various mag- 



netic stations, 107. 

 Hornblende and augite, 443. 

 Hornitos, low volcanic cones, 176 ; farther 



notices of them, 298, 303. 

 is on the Hornos or Hornitos. See Hornitos. 



Horsburgh, description of Barren Island 



by, 359. 



