INDEX 



TO 



VOLUME IV. PART I. 



ABICH, connection between earthquakes and thermal and gaseous springs, p. 175 ; 

 mud-volcanoes in the Caucasus, p. 207; Caucasian mountain-system, p. 340 ; 

 chemical analyses, Notes 604 and 610. 



Africa, volcanoes of, p. 332. 



Airy, density of the earth, p. 449 ; figure of the earth, p. 483, and Note 18. 



Aleutian Islands, volcanoes of, p. 352, 411. 



America, volcanoes of Central, p. 262, 308 ; of North-west, p. 388403 ; of South, 

 p. 2C9 278. 



Amsterdam Island, p. 370, Note 503. 



Andesite, p. 428, and Note 609. 



Ansango, Volcan de, p. 312314, 316. 



Antilles, volcanoes in the, Note 555. 



Antisana, Volcano of, p. 310-314, 316, Note 450. 



Ants, shining mineral fragments carried by them to form their hills, Note 618. 



Arabia, volcanic activity in, p. 338. 



Arago, rotation magnetism, p. 70; magnetic observations, p. 449; connection of 

 magnetic disturbances with auroras, Note 134. 



Ararat, p. 239 ; ascents of, p. 340; eruptions of, p. 341. 



Arcs (meridional and parallel), measurements of, p. 2123, Notes 79 ; latest 

 conclusions from, p. 482. 



Arequipa, volcano, height of, discussed, Note 369. 



Argaeus, Mount, Note 356. 



Aristotle, references to, p. 9, 14. 



Artesian wells, p. 35 38. 



Ascension, Island of, p. 330. 



Asia, volcanoes of "Western and central, p. 334 342 ; of eastern, 342348 ; of 

 eastern and southern Asiatic islands, p. 349 361 and 361 367 ; mountain- 

 systems, volcanic activity and area of depression in central, p. 414417. 



Atlantic Ocean, volcanoes in islands in the, p. 328. 



Attraction, discussion of molecular and mass attraction, p. 10, 17, and Note 2. 



Augite, p. 439. 



Aurora, p. 153159 and 495, Notes 205211 ; connection of, with magnetic dis- 

 turbances, Note 134. 



Auvergne, extinct volcanoes and volcanic phenomena in, p. 236, 327, 414, Note 

 566. 



Azores, geological conformation of the, Note 308. 



Azufral, de Quindiu, p. 218219. 



