INDEX. 



Leucites, p. 440 and Notes 317 and 607. 

 Lipari, p. 319. 



Lloyd, terrestrial magnetism, p. 77 and 80. 

 Lutke, p. 71, 346348. 



Maars, in the Eifel, p. 229236; in Auvergne, p. 236. 



Macdonald, early observations on magnetic variations in Sumatra, p. 131 and 

 Note 162. 



Madeira, p. 329. 



Madre, Sierra, p. 394. 



Magnetism, terrestrial, p. 49161 ; early knowledge of, p. 51 ; ^chronological 

 enumeration of the advances in knowledge in the first half of the present 

 century, p. 6585; insufficiency of the thermic hypothesis to explain the 

 observed phenomena, p. 87 ; connection with the solar spots, p. 81, 89, 492; 

 geographical distribution of the phenomena, p. 91 ; influence of height above 

 the earth's surface or of depth beneath it, p. 102 and 120, Notes 111 and 145 ; 

 magnetic variations according to hour and season, p. 106, 112, 126 and 496 

 516, and Notes 80 and 120; magnetic disturbances, p. 135 et seq.; and 485 

 495 ; solar-diurnal variation, p. 496516 ; lunar-diurnal variation, p. 451. 



Makerstoun, magnetic observations at, p. 82. 



Mallet on earthquakes, Notes 230, 234, and 239. 



Malpais, of Jorullo, p. 293295, 304-307, 383, 398 ; Note 423. 



Masaya, Volcan de, p. 253, 255, Notes 376-378. 



Mauna Loa or Mauna Roa, description of, p. 374377, and Notes 359, and 511. 



Methana or Methone, p. 227, 327, and Note 310. 



Mexico, volcanoes of, p. 267269, 304307 and 387388 ; broad elevated tract of, 

 p. 390. 



Mica, p. 438. 



Middendorff, ground-ice, p. 4347, Notes 46, 47, and 51. ' 



Mitscherlich, chemical analyses, p. 214 ; fusion of granite, p. 244 ; on the Eifel 

 eruptions, Note 317. 



Monk Wearmouth, pit waters of, p. 37. 



Moon, magnetic influence of, p. 90 and 451 ; surface of, p. 164165, and Note 589. 



Moore (Commander), p. 82. 



Monte Nuovo, p. 303. 



Morichini, p. 66. 



Mosenberg, the, p. 230, 232, 425. 



Moya, p. 168, 171, and 174. 



Mud-volcanoes, of the Taman peninsula, p. 207, 209, and 213; of Turbaco, p. 

 211216, and Notes 294 and 296 ; in islands in the Indian Ocean, Note 299. 



Murchison (Sir Roderick), eruption of vapours in Tuscany, p. 210, and Note 289 ; 

 effects of volcanic action in Llandilo flags, p. 328 and 448. 



Naphtha springs, p. 206 and 207, 220, 227228, Notes 304, 572. 

 Neu Salzwerk, Artesian well of, p. 36. 

 Nisyros, p. 327. 

 Nuovo, Monte, p. 303. 



Obsidian, p. 443. 



Oersted, p. 69. 



Oligoclase, Notes 593 and 594. 



Olivine, p. 441. 



Orinoco, temperature of its waters, p. 186, and Note 256. 



