INDEX 



Dubois, Eugene, his find of the ape- 

 man fossil in the island of Java, 

 120. 



Dujardin, Felix, his histological re- 

 searches, 339. 



Dulong and Petit's discovery of the 

 specific heat of atoms, 260, 261. 



Dumas, Jean Baptiste Andre, his 

 work in organic chemistry, 266, 

 268, 279, 280, 346, 347. 



Dunn, Sergeant, his principal work in 

 weather observation, 190. 



Dutrochet, Rene Joachim Henri, his 

 study of the processes of digestion, 

 352. 



EARTH, the, Thomson's estimate of its 

 longevity, 74, 154; some unsolved 

 problems regarding, 435-442. 



Ehrenberg, Christian Gottfried, dis- 

 putes Mohl's cell theory, 343 ; dis- 

 covers the fibrillar character of 

 brain tissue, 425. 



Electricity, conception of, in the 

 eighteenth century, 24 ; how af- 

 fected by the discovery of Volta, 

 28, 29 ; its relationship to galvan- 

 ism demonstrated, 204, 205 ; the 

 cause of chemical and electrical 

 action demonstrated to be identi- 

 cal, and the science of magneto- 

 electricity established, 206-209 ; 

 its first use in signalling, 207. 



Electro-chemistry, its accidental dis- 

 covery through the experiments of 

 Nicholson and Carlyle, 28 ; Davy's 

 theory of, 206. 



Electro - magnetism, Helmholtz and 

 Hertz's study and development of, 

 227, 228. 



Encke, Johann Franz, determines the 

 orbital movement of comets, 57. 



Espy, James Pollard, his theory of 

 wind storms, 190. 



Ether, sulphuric, discovery of its 

 anaesthetic properties, 369-374. 



Ether, the, and ponderable matter, 

 its displacement of the " imponder- 

 ables," 228, 229 ; its discovery, and 

 speculations as to its constitution 

 and properties, 230-236 ; experi- 

 ments of Helmholtz and Thomson 

 to prove the vortex theory of atoms, 



236-240 ; theories as to the distri- 

 bution, mutual relations, properties, 

 and dimensions of molecules, 241- 

 245 ; also as to their outline, ac- 

 tion, temperature, and energy, 245- 

 251 ; the hypothesis that the vor- 

 tex whirl is the essence of matter 

 itself, 251. See Chemistry. 



Euler, Leonhard,his extraordinary con- 

 clusion as to the midnight temper- 

 ature at the equator, 175. 



Evans, John, aids Prestwich in mak- 

 ing report on the paleolithic im- 

 plements found at Abbeville, 109. 



Evaporation and precipitation, the- 

 ories regarding, and the determina- 

 tion of their causes, 167-172. 



Evolution, theories of, 288-297, 302- 

 310, 317-320 ; some unsolved prob- 

 lems regarding, 454-456. 



FALCONER, HUGH, verifies the paleo- 

 lithic find of Perthes at Abbeville, 

 109. 



Faraday, Michael, attributes the aurora 

 to magnetism, 164 ; establishes and 

 develops the science of magneto- 

 electricity, 208, 209, 226 ; refuses 

 to accept the doctrine of the con- 

 servation of energy, 218; his con- 

 ception of an invisible, all-pervad- 

 ing plenum, 234 ; liquefies carbonic- 

 acid gas, 249 ; confirms Berzelius's 

 theory of binary combinations, 265. 



Favus, its cause discovered, 365. 



Fechner, Gnstav Theodor, his re- 

 searches in the new science of 

 " physiological psychology," 409- 

 412. 



Fermentation and putrefaction, inves- 

 tigation of the processes of, 375- 

 380. 



Ferrel, William, his rediscovery of 

 the cause of atmospheric circula- 

 tion, 183, 184. 



Ferrier, David, his experiments in 

 brain localization, 420, 421. 



Fizeau, Hippolyte L., his experiments 

 on light, 222 ; his experiments on 

 ether, 234. 



Flourens, Marie Jean Pierre, his ex- 

 periments in nerve physiology, 

 417, 418. 



464 



