500 



INDEX. 



Villarica, Volcan de, 290. 



Vincent, St., the volcano of, 422. 



Vincent of Beauvais, his mention 

 of the magnetic needle, 53. 



Virgenes, las, extinct volcanoes in 

 Old California, 416. 



Vitruvius, notice of Vesuvius by, 

 428. 



Vivarais, extinct volcanoes of the, 

 278. 



Volcan Viejo, a crater in Southern 

 Peru, 286. 



Volcancitos of Turbaco, described, 

 213. 



Volcanic districts, different aspects 

 presented by, 224. 



Volcanic islands in the South 

 Atlantic Ocean, 353. 



Volcanic reaction, bands of, 176. 



Volcano, what intended under the 

 term, by Humboldt, 287. 



Volcano, the island styled "the 

 holy isle of Hephsestos," 257. 



Volcanoes, considered according 

 to the difference of their forma- 

 tion and activity, 224 ; definite 

 language of modern science, 

 228 ; number of, on the earth, 

 421 ; their great number in the 

 Eastern Archipelago, 379 ; hyp- 

 sometry of, 246 ; linear arrange- 

 ment of, 268; table of dif- 

 ferences in structure and colour 

 of the mass in certain, 463 ; the 

 Mexican system, 279 ; sequence, 

 latitude, and elevation, 281 ; 

 particulars of the five groups of, 

 in the New Continent, 285 ; 



list of active, 277 ; geography of 

 active, examined, 349 : geogra- 

 phical distribution of, 430; open 

 in historical periods, list of, 35 1 ; 

 semi-volcanoes, 424. 



Volcanoes of the moon, 448. 



Vulcanicity, definition of, 163. 



Wales, volcanic phenomena in, 

 350. 



Walferdin on Artesian wells, 35, 



Waltershausen, his classification 

 of the volcanoes of Iceland, 

 351 ; remarks on the period of 

 recurrence of eruptions in 

 various volcanoes, 255, on the 

 trachytes of Etna, 465. 



Wilkes, Captain, commander of 

 the American expedition, 105, 

 388. 



Wislizenus, positions in North- 

 West America ascertained by, 

 408. 



Wisse, his observations of the 

 eruptions of the volcano of 

 Sangai, 182; 264; his visit to 

 Pichincha, 242. 



Yana-Urcu, a volcanic hill, 193. 

 Yanteles (Yntales), volcano of, 

 290. 



Zapatera, extinct crater of the 



island, 273. 

 Zohron, the southern pole of the 



magnetic needle, 53. 

 Zone of volcanic activity, 176. 

 Zuni, petrified forest near, 414. 



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