ANALYTIC AN INDEX. 



number in different latitudes, 22 ; the great laboratories of the 

 earth, 22, note ; irruptions of, described by Scrope, and Sir 

 W. Hamilton, 398 ; of Cosiguina, 399 ; two hundred situated 

 on dry land within the vicinity of the ocean, 400 ; submarine, 

 400, 401 ; numerous in South America, 403 ; extinct in 

 North America, 403 ; not owing- to a central fire, 407 ; num- 

 ber of irruptions throughout the earth in a country, 410 ; great 

 numbers of, beneath the sea, 415; indispensable to the well- 

 being of our planet, 416. 



VOLKMAN, his experiments on frogs, 599. 



VOLNEY, on Egyptian symbols, 743, note. 



VOLTA, his theory of atmospheric electricity, 305 ; his theory of 

 the pile, 372. 



VOLTAIRE on the cause of animal motion, 458 ; on the varieties 

 of mankind, 720. 



VOLUMES, theory of, 56, 70 ; their relations to atomic weights, 

 62, 64 ; how connected with caloric, 65, 66. 



WAGNER, on incubation, 639. 



WASHINGTON, General, the cause of his death, 801, note. 



WATER, its composition and importance, 79 ; the different crys- 

 talline forms which it assumes, 93, 94. 



WATER-SPOUTS, 330 ; observed by Captain Lawrence, 334 ; des- 

 cribed by Dr. Franklin, 334. 



WEDEMEYER, finds the capillary circulation retarded by injections 

 of alcohol and vinegar, 621, note ; applies Prussic acid to the 

 brain of a horse, 967. 



WELLS, J)r., on the radiating power of different bodies, 191 ; his 

 theory of dew, 356. 



WHALE, size of its brain, 596 ; peculiarity of its organization, 

 597, note', its temperature and blanket of fat, 889. 



WHEWELL, Rev. W. on the present state of knowledge in regard 

 to heat, preface, p. 7 ; on our ignorance of natural laws, 196, 

 197, 506 ; on the attraction of masses, 271, on Newton's first 

 law of motion, 36, note, 276 ; on the vacuum, 37 ; on the 

 luminous aether, 37, note; on the nervous fluid, 600, note ; 

 on prospects of the future, 624. 



WICKSTEAD, Thomas, on the steam power generated from burning 

 100 Ibs. of coal, 675. 



WILFORD, on pulsations of the heart of the boa, 618, note. 



WILLIS, his theory of the nervous system, 585. 



WILSON, Dr., his treatment of typhus, 1062, note. 



WINDS, theory of, 20, 21, 321, 322 ; promote evaporation, 292 ; 

 westerly in the higher latitudes, 327 ; westerly, moderate the 

 climate of Europe and America, 695, note. 



