INDEX. 



459 



Moon, extent of onr acquaintance with thejOrthoclase, 448. 



surface of the, 418; volcanoes and para- Osomo, volcano of, 2T4. 



aters, 419 ; Kreil on the magnet- Overweg's researches on volcanic phenom- 



sitic craters, 419 . 



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, 

 227. 



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. 



ena in Africa, 334. 

 Ovid, volcanic phenomena clearly described 



by, 219. 

 Dwhyhee. See Hawaii 



*acaya, eruptions of, 2C2. 



Pacific Ocean, the term "Grand Ocean" 

 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. 



Mousart (corruption of Muztag), equivalent Panguipulli, Volcan de, 274 



to Sierra Nevada, 405. 

 Moya cones of Pelileo, 166, 207. 

 Mud springs of Iceland, 203. 

 Mud volcanoes, 207, 255. 

 Murchison, Sir R., on eruptive trap masses, 



329, 451. 



Muriatic acid fumaroles, 397. 

 Mutis, apparatus of, 428. 



Naphtha springs, 199. 



Negropont. See Eubosa. 



Neptune, connection of, with earthquakes, 



173. 



New Britain, volcanoes of, 371. 

 New Caledonia, volcanic action 



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, determine 



tion of the magnetic needle in London, 

 ' 58. 

 Northwest America, volcanoes of, 377; 



hypsometry of, 382. 

 No variation (magnetic), points and lines 



of, 55, 59. 



Obsidian, 447; its cavities and air-holes 



449. 

 Oerafa, in Iceland, fearful eruptions of 



330. 



at, 39. 

 Oisans, natural amphitheatre of, its vas 



extent, 220. 

 Oligoclase, 439. 



Olot, extinct volcanoes of, 405. 

 Olympus, Mount, in America, 390. 

 Omato, Volcan de, 271. 

 Ometepec, an active volcano, 259. 

 Orinoco, high temperature of its waters a 



certain seasons, 179. 

 Orizaba, a volcano, measurement of the 



peak of, 239; lava field of, 305. 



the, 408. 

 Orosi, the volcano, 260. 



Papagayos, remarkable storms so called, 



257. 

 3 aramagnetism exhibited by oxygen gas, 



51 ; importance of the discovery, 78, 81, 



98. 

 Paramos, their elevation and vegetation, 



278. 



3 arasitic 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 observers, 



26 ; the form of the earth not exactly 



determinable by such means, 29 ; Airy's 



experiments at Harton, 35. 

 Pentland, his discovery 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. 



the inclina- 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. 



Philippines, volcanoes of the, 232. 



Phlegnean 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 



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 the leucite crystals of Rocca Mon- 

 fina, 434. 



Pisoje, basalt-like columns of, 426. 



Pithecusa?, Bokh 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. 



