INDEX. 



459 



ism of the, 84 ; investigation of the sub- 

 ject by General Sabine, 84. 

 Mormons, Great Salt Lake of the, 383. 

 Mortero, Cerro del, 302. 

 Mosenberg, the, an extinct volcano, 222, 



22T. 

 Mosychlos, the mountain, destruction of, 



328. 



Mouna Loa. See Mauna Roa. 

 Mountain masses, magnetism of, 154. 

 Mountain peaks, comparison of, with the 



bulging of the earth's surface, 31. 

 Mousart (corruption of Muztag), equivalent 



to Sierra Nevada, 405. 

 Moya cones of Pelileo, 166, 207. 

 Mud springs of Iceland, 203. 

 Mud volcanoes, 20T, 255. 

 Murchison, Sir R., on eruptive trap masses, 



329, 451. 



Muriatic acid fumaroles, 39T. 

 Mutis, apparatus of, 428. 



Naphtha springs, 199. 



Negropont. See Euboea. " 



Neptune, connection of, with earthquakes, 



173. 



New Britain, volcanoes of, 371. 

 New Caledonia, volcanic action absent 



from, 372. 



New Guinea, volcanoes of, 371. 

 New Mexico, barometric levelings in, 380 ; 



list of heights, 382. 

 New Zealand, geology of, 371 ; volcanoes, 



372. 



Niphon, recorded volcanic eruptions in, 350. 

 Nodes, magnetic, their changes of position, 



102, 104. 

 Noises from volcanoes, differences observed 



in, 250; extraordinary distances at which 



heard, 251. 

 Norman, Robert, determines the inclina- 

 tion of the magnetic needle in London, 



ena in Africa, 334. 

 Ovid, volcanic phenomena clearly described 



by, 219. 

 Owhyhee. See Hawaii. 



i'acaya, eruptions of, 262. 



Pacific Ocean, the term u Grand Ocean 1 ' 

 improperly applied to the, 378 ; compar- 

 atively small number of active volcanoes, 

 364; grouping of its islands by Dana, 

 365. See, also, South Pacific Ocean, 

 South Sea. 



Panguipulli, Volcan de, 274. 



yos, remarkable storms so called, 



58. 

 Northwest 



America, volcanoes of, 377: 



hypsometry of, 382. 

 No variation (magnetic), points and lines Philippines, volcanoes of the, 232. 



of, 55, 59. 



Obsidian, 447; its cavities and air-holes, 



449. 

 Oeriifa, in Iceland, fearful eruptions of, 



330. 



OLsans, natural amphitheatre of, its vast 



extent, 220. 

 Oligoclase, 439. 



Olot, extinct volcanoes of, 405. 

 Olympus, Mount, in America, 390. 

 Omato, Volcan de, 271. 

 Onretepec, an active volcano, 259. 

 Orinoco, high temperature of its waters at 



certain seasons, 179. 

 Orizaba, a volcano, measurement of the 



peak of, 239 ; lava field of, 305. 



the, 408. 

 Orosi, the volcano, 259. 



D aramagnetism exhibited by oxygen gas, 

 51 ; importance of the discoveiy, 78, 81, 

 98. 



Paramos, their elevation and vegetation, 

 278. 



Parasitic craters of the moon, 419. 



Parinacota, volcano of, 271. 



Passuchoa, the extinct volcano of, 317. 



Patricius, the bishop, his theory of central 

 heat, 188. 



Paul, St., volcanic island of, 360. 



Pele's hair, volcanic glass so called, 367.. 



Pelileo, eruption of the Moya of, 166, 207. 



Pendulum, vibrations of the, applied to 

 determine the figure of the earth, 23 ; 

 Sabine' s expedition, 26 ; other observer^ 

 26 ; the form of the earth not exactly 

 determinable by such means, 29 ; Airy's 

 experiments at Harton, 35. 



Pentland, his discoveiy of lava streams in 

 the eastern chain of the Andes, 279. 



Perlite, 323. 



Pertusa, hot springs of, 188. 



Peru and Bolivia, series of volcanoes of, 

 276. 



Peshan, volcano of, 335, 406. 



Petermann's notices from Overweg, of vol- 

 canic phenomena in Africa, 334. 



Peteroa, volcano of, 273. 



Phaselis, flame of the Chimsera, near, 203. 



Phlegrsean Fields, ancient descriptions of 

 the, 400. 



Pic de Nethou, the highest summit of the 

 Pyrenees, 220. 



Pic of Timor, formerly an ever-active vol- 

 cano, 358. 



Oeynhausen, temperature of the salt spring Pichincha, remarkable form of, 230; ascent 

 at, 39. of, by Humboldt, 231 ; visited by Wisse, 



231; its height, 238. 



Pichu-Pichu, Volcan de, 271. 



Pico, the volcano, 236 ; eruptions of other 

 volcanoes in the Azores apparently de- 

 pendent on, 330. 



Piedmont, trembling of the earth in, 176. 



Pilla, on theleucite crystals ofRocca Mon- 

 fina, 434. 



Pisoje, basalt-like columns of, 426. 



Pithecusse, Bb'kh on the, 253. 



Pitt, Mount, in America, 389. 



Oron, fresh-water lake of, seals found in Plato, on the Pyriphlegethon, 37, 254 ; on 



the magnetic chain of rings, 51. 

 Polar light. See Aurora. 



