INDEX TO VOL. V. 



ABTOH on volcanic phenomena in 

 Ghilan, 175; his views on the 

 Caucasian mountain system, 209, 

 360 ; analysis of the Chimborazo 

 rock, 462. 



Aconcagua, volcano of, measure- 

 ment of, 288. 



Acosta on the volcaucitos of Tur- 

 baco, 214. 



Adanis, Mount, a volcano, 417. 



JSnaria, the island of Apes, 265. 



^Eolus, residence of, on Strongyle, 

 257. 



Africa, determination of the mag- 

 netic equator in, by Sabine, 103 ; 

 its translation, 106 ; snowy 

 mountains in, 354; volcanoes 

 in, 354 ; their small number, 

 355. 



African magnetic node, its varying 

 position, 103. 



Agaschagokh, island of, 371. 



Agreeable odour diffused from 

 certain volcanoes, 229. 



Agua, Volcan de, described, 276. 



Airy, density of the earth deter- 

 mined by, vii ; on terrestrial 

 magnetism, 79. 



Alaid, great eruptions of the vol- 

 cano on the isle of, 372. 



Albite, 469. 



Aleutian islands, numerous volca- 

 noes in, 370. 



Alps, temperature of springs in 

 the, 192. 



America. See Central America, 

 Chili, Mexico, North-west Ame- 

 rica, Peru and Bolivia, Rocky 

 Mountains, South Sea. 



Ampere on the cause of earth- 

 quakes, 168. 



Ampolletas, 56. 



Amsterdam, volcanic island of, 

 385. 



Anahuac, series of volcanoes of, 

 280. 



Anaxagoras, maxim of, verified, 7. 



Andaman isles, volcanic pheno- 

 mena in the, 383. 



Andes, large spaces in the chain 

 of, destitute of volcanoes, 282; 

 groups and distances, 283 ; spe- 

 cial direction of the three Cor- 

 dilleras, 292. 



Andesite, 468, 471. 



Andrea Bianco, his early charts, 

 exhibit the magnetic variation, 

 54. 



Anemasite, 478. 



Annular valleys, 231. 



Ansango, lake of, 3. 



Ansogorri, Father Joaquin, his de- 

 scription of the rise of the vol- 

 cano Jorullo, 310. 



Ant-hills, in the Rocky Mountains, 

 their remarkable construction, 

 475. 



Antilles, Little, volcanoes of the, 

 described, 421. 



Antisana, the colossal mountain, 

 described, 331 , its dykes, 331 ; 

 lakes, 332. 



Antuco, volcano of, 289. 



Aphron, the northern pole of the 

 magnetic needle, 53. 



Apparatus employed by Humboldt 

 for his 453 determinations of 

 height in the New World, 459. 



Arabia, lava eniptions in, 357. 



Arago on magnetic inclination, 

 107 ; his series of magnetic ob- 

 servations, vii. 



Ararat, as a volcano, 361. 



Arare, crater of, 393. 



Arequipa, volcano of, 286. 



Ai'gaeus, the volcano, 249. 



Arimer, country of the, 266. 



Aristotle on the fundamental 



