INDEX. 



491 



his visit to Joruilo, 313, 319; 

 the name Jura limestone intro- 

 duced by, 468 ; apparatus em- 

 ployed by, in the New World, 

 459 ; his mineralogical collec- 

 tions, 477 ; on the formation of 

 pumice, 483. 



lumboldt, Alexander von, works 

 by, cited in the text or notes : 



Asie Centrale, 51, 101, 116, 

 148, 149, 176, 208, 210, 

 219, 220, 250, 295, 336, 

 356, 358, 360, 361, 372, 

 376, 438. 



Atlas Geographique et Phy- 

 sique de la Nouvelle Es- 

 pagiie, 239, 247, 263, 309, 

 432. 



Essai Geognostique sur le 

 Gisement des Roches, 221, 

 320, 444, 454, 468, 475, 483. 



Essai sur la Geographic des 

 Plantes, 252, 458. 



Essai Politique sur la Nou- 

 velle Espagne, 42, 197, 279, 

 280, 293, 310, 312, 326, 

 406, 418, 458. 



Examen Critique de l ? His- 

 toire de la Geographic, 51, 

 119, 126, 180, 244, 260. 



Fragmens de Ge'ologie et de 

 Climatologie Asiatique, 

 372, 377. 



Kleinere Schriften, 171, 214, 

 239, 291, 332, 336, 341, 

 451, 478. 



Recueil d' Observation s As- 

 tronomiques, 41, 104, 143, 

 222, 251, 279, 315, 326, 

 444, 459, 464, 481. 



Relation Historiquedu Voyage 

 aux Regions equinoxiales 

 (Personal Narrative, Bonn's 

 edit., 1852-3), 97, 112,115, 

 117, 173, 175, 187, 249, 

 250, 303, 422, 423, 479. 



Views of Nature, 261, 365, 

 408, 427. 



Vues des Cordilleres, 217, 

 239, 242, 247. 



Hypersthene rock, its employment 



for ornamental purposes, 478. 

 Hypsometry. of volcanoes, first 



group, 246 ; second group, 247 ; 



third group, 248 ; fourth group, 



250 ; fifth group, 251. 



Iceland, the Geysirs of, 198 ; mud 

 springs, 212 ; volcanoes, 351. 



Ilha do Fogo, one of the Cape 

 Verd Islands, so called, 262. 



Impulse in volcanic phenomena, 

 summary of views on, 167. 



Inarima, 266. 



Inclination, magnetic, 102 ; max- 

 ima and minima, 109 ; secular 

 variation, 111. 



Indian Ocean, volcanoes of the, 

 382, 387. 



Infusoria, universal diffusion of 

 the, 237. 



Intensity of the magnetic ter- 

 restrial force, 57, 61, 87. 



Interior of the earth, its reaction 

 on the surface, 162. See also 

 Earthquakes, Volcanoes. 



Invariable temperature, stratum 

 of, 39. 



Ischia, 265. 



Island of Desolation. See Ker- 

 guelen's Island. 



Islands, temporary, enumerated, 

 349. 



Islands and the shores of conti- 

 nents, great number of vol- 

 canoes found on, 431. 



Islands of the Pacific, Dana's 

 classification of, 390. 



Isluga, volcano of, 287. 



Izalco, volcano of, described, 261 ; 

 its eruptions, 276, 



Iztaccihuatl, a volcano, meaning 

 of the name, 239. 



Jacob, valley of, on Ararat, 241. 



Jakutsk, mean annual tempera- 

 ture of, 45: extreme variations. 

 45. 



Jan Mayen, volcanoes of the island 

 of, 351. 



