INDEX TO VOL, V, 



volcanic phenomena in Ghilan, Antisana, the colossal mountain, described, 



169 ; his views on the Caucasian mount 



ain system, 201, 383 ; analysis of the Antuco, volcano of, 273. 



Chimborazo rock, 431. 

 Aconcagua, volcano of, measurement of, 



273. 



Acosta on the volcancitos of Turbaco, 205. 

 Adams, Mount, a volcano, 390. 

 yEnaria, the island of Apes, 252. 

 yEolus, residence of, on Strongyle, 244 

 yEtna, eruptions of, usually occur within a 



space of six years, 243; periods of its 



greatest activity, 244; height to which 

 ejected matters attain, 251; its trach- 

 ytes, 434. 



Africa, determination of the magnetic 

 equator in, by Sabine, 102 ; its transla- 

 tion, 104; snowy mountains in, 333; vol- 

 canoes in, 332 ; their small number, 334. 



African magnetic node, its varying posi- 

 tion, 102. 



Agaschagokh, island of, 348. 



Agreeable odor diffused from certain vol- 

 'canoes, 219. 



Agua, Volcan de, described, 262. 



Airy, density of the earth determined by, 

 35 ; on terrestrial magnetism, 79. 



Alaid, great eruptions of the volcano on 

 the Me of, 349. 



Albite, 438. 



Aleutian islands, numerous volcanoes in, 

 347. 



Alps, temperature of springs in the, 184. 



America. See Central America, Chili, 

 Mexico, Northwest America, Pent and 

 Bolivia, Rocky Mountains, South Sea. 



Ampere on the cause of earthquakes, 162. 



Ampolletas, 57. 



Amsterdam, volcanic island of, 360. 



Anahuac, series of volcanoes of, 266. 



Anaxagoras, maxim of, verified, 11. 



Andaman isles, volcanic phenomena in the 

 359. 



Andes, large spaces in the chain of, desti 

 tute of volcanoes, 267 ; groups and dis 

 tances, 268 ; special direction of the 

 three Cordilleras, 276. 



Andesite, 437, 439. 



Andrea Bianco, his early charts exhibi 



the magnetic variation, 55. 

 Anemasite, 446. 

 Annular valleys, 221. 

 Ansango, lake of, 313. 



311 ; its dikes, 312; lakes, 313. 



n.ntuco, volcano of, 273. 



Aphron, the northern pole of the mag- 

 netic needle, 54, 



Apparatus employed by Humboldt for hia 

 453 determinations of height in the Ne\v 

 World, 428. 



\rabia, lava eruptions in, 336. 



Arago on magnetic inclination, 105; his 

 series of magnetic, observations, 75. 



Aiarat, as a volcano, 339. 



Arare, crater of, 368. 



Arequipa, volcano of, 270. 



Argseus, the volcano, 237. 



Ansogorri, Father Joaquin, his description Banda, a volcanic island, 357. 



of the rise of the volcano Jorullo, 292. 



Arimer, country of the, 252. 



Aristotle on the fundamental principles of 

 nature, 9; volcanic phenomenon upon 

 Hiera described by, 219. 



Arran, volcanic phenomena in, 329. 



Artesian wells, Walferdin's observation 

 on, 38. 



Ascension, volcanic phenomena of the isl- 

 and of, 831. 



\sia, situation of the principal volcanoes 

 in, 281 ; volcanoes of the western and 

 central parts, 334; of Kamtschatka, 340 ; 

 of the islands of Eastern Asia, 344 ; of 

 the islands of Southern Asia, 354; of tho 

 Indian Ocean, 358. 



Atlantic Ocean, volcanoes of the islands 

 of the, 330; presumed submarine vol- 

 cano, 332. 



Atlantis of Solon, 173. 



A.tolls, or lagoon reefs, 363. 



Attraction of the magnet known to the 

 Greeks and Romans, 51. 



Augite, 443. 



Aurora Borealis, 147 ; observations of the 

 black segment, 148; colors observed in 

 high latitude?, 149 ; accompanying fleecy 

 clouds, 150 ; influence on terrestrial mag- 

 netism, 152 ; observations at Berlin and 

 at Edinburgh, 153. 



Auvergne, extinct volcanoes of, 227, 263. 



Azores, craters of elevation in the, 217; 

 the volcano of Pico, 236. 



Azufral de Quindiu, Humboldt' s visit to 

 the, 211; change of temperature ob- 

 served by Boussingault, 212. 



Baily on the density of the earth, 34. 

 Baker, Mount, a volcano, 390. 



Barbn, the volcano, described, 259. 



Ant-hills in the Rocky Mountains, their Barile, earthquake at, 167. 



remarkable construction, 443. 

 Antilles, Little, volcanoes of the, described, 



Barrancos on the slopes of volcanoes, 



287. 

 Barren Island, one of the Andamans, r.p- 



