4G0 



INDEX. 



Polarity, the force of, unknown to the 

 Greeks and Komans, 51. 



Polea, magnetic, traditions regarding, 56 ; 

 Ilalley's variation chart, 60. 



Polybius, hi.s knowledge of St^ongyle, 244. 



Polynesia and similar divisional terms, ob- 

 jected to, 304. 



Pomarape, volcano of, 271. 



Popocatepetl, a volcano, 239 ; meaninggB 

 the name, 228; determinations of Wte 

 height of, 427. 



Porphyries of America, 443. 



Porphyiy of the Puy de Dome, its peculiar 

 character, 421. 



Porto Cabello, hot springs of, 190. 



Pozzuoli, eruption from the solfatara of, 

 395. 



Procida or Pi'ochyta, 252. 



Proclus on earthquakes, 173. 



Pulu Batu, lava streams of, 358. 



Pumex Pompejanus, 402. 



Pumice not found at JoruUo, 301; abun- 

 dant in Lipari, 320 ; the pumice quarries 

 of Lactacunga, 321; of Cotopaxi, 322; 

 isolated eruptions of, 323; found in 

 Madagascar, 360; and in the island of 

 Amsterdam, 301; Humboldt's view of 

 its formation, 450. 



Pumice eruption of the Eifel, 226. 



Punhamuidda, volcano of, 274. 



Pusambio, the river, acidified by sulphur, 

 194. 



Pyrenees, highest summits of the, 220, 221. 



Pyriphlegethon, Plato's geognostic myth, 

 37, 254. 



Quelpaert's island, a volcano, 353, 



Que.^altenango, Volcan de, 262. 



Quetelet on daily variations of tempera- 

 ture, 41. 



Quindiu. See Azufral de Quindiu. 



Quito, observations on the older rocks of 

 the volcanic elevated plains of, 415. 



Quito and New Granada, the group of vol- 

 canoes of, 200. 



Rainier (or Regnier) Mount, an active vol- 

 cano, 390. 



Rains, regions of summer, autumn, and 

 winter, ISO. 



Raking of mountain chains explained, 

 278. 



Rammelsberg's analysis of the Chimborazo 

 rock, 431. 



Ranco, volcano of, 274. 



Rapilli, 223. 



Raton Mountains, extinct volcanoes of the, 

 380. 



Regnier, Mount, an active volcano, 391. 



Rehme, the Artesian well at, 39. 



Reich's experiments to determine the dens- 

 ity of the earth, 34; the subject more 

 lately investigated by Aiiy, 35. 



Results of observations in the telluric por- 

 tion of the physical description of the 

 universe, 13. 



Revillagigedo, volcanic islands of, 200. 



Ribbed formation of the volcanoes of the isl- 

 and of Java, 286 ; analogous phenoraona 

 of the mantle of the Somma of Vesuvius, 

 288. 



Richer, observations on the pendulum, by, 



Rigaud, Professor, on the proportion of 

 water and terra firma, 303. 



Rindjani, a volcano, its height, 357. 



Riobamba, terrible earthquake at, 101, 166, 

 107. 



Rio Vinagre, described, 194. 



Rock-debris, 311. 



Rocky Mountains, the chain described, 

 385; traces of ancient volcanic action, 

 387 ; parallel coast ranges, still volcanic, 

 388. 



Ronquido and bramido^ distinguished, 250. 



Rope-boring of the Chinese, 209. 



Rose, Gustav, his classification of volcanic 

 rocks, 420, 423. 



Ross, Sir Jame^ Clark, his Antarctic voy- 

 age, 75, 141. 



Ross, John, his Polar voyages, 65. 



Rucu-Pichincha, its meaning, 231. 



Ruido, el (jran^ 166. 



Sabine, Major-General, his pendulum ex- 

 pedition, 26 ; on the horary and annual 

 variations, 81; on the influence of the 

 moon on terrestrial magnetism, 84. 



Sacramento Butt, an extinct crater, 389. 



Saghalin, called Krafto by the Japanese, 

 345. 



Silhama, Volcan de, 271. 



Salses and naphtha springs, 199. 



Salt Lake, Great, of the Mormons, 383. 



San Bruno, rotatory motion of the obelisks 

 before the nionasteiy of, in Calabria, 166. 



San Clemente, volcano of, 274. 



Sandwich Islands, a volcanic Archipelago, 

 366 ; the volcanoes, 233 ; height of some 

 greatly exaggerated, 238. 



Sangai or Sangay, the volcano, 239; its 

 position, 239 ; the most active fof the 

 South American volcanoes, 249 ; its erup- 

 tions observed by Wisse, 175. 



Sanidine, 443. 



San Miguel Bosotlan, a volcano, 261. 



San Pedro de Atacama, Volcan de, 273. 



San Salvador, a volcano, eruptions of, 261. 



Santa Cruz, volcano of, 309, 



Santorin, volcanic eruption of, 219. 



San Vicente, a volcano, eruptions of, 261. 



Saragyn, hot springs of, 325. 



Sawelieff on magnetic inclination. 111, 



Schagdagh, the perpetual fires of the, 201. 



Schergin's shaft, at Jakutsk, 45. 



Schiwelutsch, a volcano, its peculiar form, 

 237. • 



Schlagintweit, the brothers, observations on 

 springs, 183; traverse the Kuen-tun, 410. 



Schrenk on the frozen soil in the country 

 of the Samojedes, 48. 



Sea, distance of volcanic activity from the, 

 statements of, examined, 404; volcanic 

 eruption observed in the, 354. 



Seals found in the Caspian Sea and the Sea 

 of Baikal, 408 ; also in the distant fresh- 

 water lake of Oron, 408. 



Secular variation of the magnetic inclina- 

 tion, 109. 



Semi-volcanoes, 390. 



Senarmont, his preparation of artificial 

 minerals, 195, 



