INDEX. 



Bache, p. 81. 



Baily, density of the earth, p. 32 ; calculation of Foster's pendulum experiments, 



p. 474. 



Barlow, p. 76. 

 Beaufoy, p. 64. 

 Belcher, p. 77. 

 Bessel, figure of the earth, p. 21 and 483, Notes 4 and 5 ; correction of pendulum 



results, p. 459, and Note 20. 

 Biot, pendulum experiments, p. 27 and 453. 

 Bolivia, volcanoes of, p. 276. 



Boracic acid vapours, eruptions of, in Tuscany, p. 209, Notes 288 and 289. 

 Borda, p. 63, 94, and 118. 

 Borneo, volcanoes in, p. 362364, Note 491. 

 Bourbon, Island of, p. 368. 

 Boussingault, view of cause of earthquakes, p. 170, and Notes 238 and 253; 



chemical analyses, p. 219, 421 ; tropical thunderstorms, Note 579. 

 Bravais, p. 157, Note 213. 



Broun, terrestrial magnetism, Notes 154 and 155. 

 Bunsen, chemical investigations into volcanic products, p. 419420. 

 Buch (Leopold von), elevation-craters, p. 225 ; general view of the volcanoes of 



the earth, p. 324. 



Carbonic-acid gas, springs of,~p. 202. 



Cascade Mountains, p. 399 400. 



Caucasus, volcanic activity in the chain of the, p. 208, Note 285. 



Celebes, volcanoes in, p. 365. 



Celsius, early suggestion of simultaneous magnetic observations, Note 72. 



Central America, volcanoes in, p. 262. 



Chemical analyses, by Rammelsberg, Abich, and Rose, Note 604. 



Chili, volcanoes in, p. 277. 



Chimaera, the, in Lycia, p. 252, Notes 289 and 375. 



Chimborazo, p. 193, 315 ; recent ascent of, Note 604. 



Chinese, knowledge of compass, p. 51 ; rope-boring, p. 216, and Note 298. 



Christie, p. 76. 



Clerk, p. 82. 



Classification, hypsometric, of volcanoes, p. 245248 ; of trachytes, p. 429. 



Clouds, cirrus, supposed connection of, with aurora and magnetic direction, p. 



156, Note 212. 



Cofre de Perote, p. 306-307, and Note 443. 

 Colima, volcano, ascent and eruption of. Note 531. 

 Columbus, line of no magnetic declination, p. 55-58. 

 Comangillas, Aguas de (hot springs), p. 198. 

 Compass, early knowledge of the, p. 5154, Note 54. 

 Conseguina (volcano), Note 390. 

 Cordilleras, their parallel branches, divisions, and nodes, Note, 402 ; snow-line 



on the, Note 330. 



Cotopaxi (volcano), p. 237, 318, 321, Notes 370, 454, and 458. 

 Craters, elevation-craters, description of, p. 225 and 228, Note 308 ; falling in of 



walls of, p. 238 ; parasitic, near Vesuvius, p. 303. 

 Crystallised minerals in the " Maars" and in Vesuvius, p. 233. 



Dana (James), his geological writings, p. 372 et seq., Notes 508 and 510516. 



Darwin (Charles), p. 278, 372 ; areas of subsidence, p. 371. 



Davy (Sir Humphry), his theory of volcanic action, p. 169, Note 237. 



