INDEX 



eral acceptance of his proposition 

 that "time is long," 97, 102; his 

 followers known as Plutonists, 123 ; 

 and their final success in proving 

 the igneous origin of rocks, 125; 

 his theory of rain, 169, 172. 



Huxley, Thomas Henry, the lesson he 

 draws from the evidence of paleon- 

 tology, 117, 118; his estimate of 

 Darwin, 317. 



Huygens, Christian, originator of the 

 undulatory theory of light, 198; 

 conceives the existence of the true 

 ether, 231. 



Hyatt, A., advocates the theory of 

 Lamarck as to the origin of favored 

 species, 318. 



Hydrogen gas, discovery of, 31. 



Hydrophobia, discovery of its cure 

 by protective vaccination, 389, 890. 



Hypnotism, investigation of its phe- 

 nomena, 415-417. 



ICEBERG THKORY, the, discussion re- 

 garding, 130-136; Ihe effects of 

 the ice-sheet in New England, 150. 



"Imponderables," the, eighteenth- 

 century controversy regarding the 

 nature, of, 24-27 ; the study of, in 

 the nineteenth century, 192-228; 

 their abolishment, 228^ 229. 



Inhalation originated by Davy as a 

 method of medication, 366. 



Insane, the, reform in treatment of, 

 395-401. 



Isomerism, discovery of, 274. 



Isomorphism, discovery of, 261. 



Itch ("gale repercutee''), its cause 

 and cure discovered, 360-363. 



JACKSON, CHARLES T., his claims to 

 the discovery of the anaesthetic 

 properties of ether, 373. 



Jenner, Edward, anil his discovery of 

 vaccination, 42, 43. 



Joule, James Prescott, discovers the 

 law of the mechanical equivalent 

 of heat, the corner-stone of the law 

 of the conservation of energy, 213, 

 214, 217, 218, 221, 223, 225.' 



KANT, IMMANUEL, conceives the idea of 

 the transmutation of species, 291. 



Keeler, Professor, his conclusions as 

 to the character of nebulae, 83. 



Kekule, A., his investigations lead to 

 the establishment of the law of 

 valency, 271. 



Kelvin, Lord. See Thomson, William. 



Kinetic theory of gases inrestigated 

 by Clausius and Maxwell, 242-245. 



Kirchhoff, Gustav Robert, with Bun- 

 sen, perfects the spectroscope and 

 invents the method of spectrum 

 analysis, 70, 283. 



Kirkdale, Yorkshire, England, dis- 

 covery of fossil bones in cave at, 

 95. 



Kirwan, Richard, calculates empiri- 

 cally the temperatures of all lati- 

 tudes, 175. 



Kitasato, Dr., a leader in the develop- 

 ment of serum-therapy, 392. 



Koch, Robert, his bacterial investi- 

 gations, 381. 



Kolliker, Rudolf Albert, confirms the 

 theory of isolated nerve cells, 431. 



LAENNEC, RENE THEOPHILE HYACINTHE, 

 discovers and practises the auscul- 

 tation method in diagnosing dis- 

 eases of the heart and lungs, 356, 

 359. 



Lagrange, Joseph Louis, systematizes 

 Newton's hypothesis of universal 

 gravitation, 15; accounts for the 

 accelerated motion of the moon, 50. 



Lamarck, Jean Baptiste, opposes the 

 theory of special creation, 103; his 

 theory of the transmutation of 

 species, 293-297 ; his selection of 

 the word "biology " to express the 

 science of living things, 298. 



Langley, Samuel Pierpont, spectro- 

 scopic researches of, 70. 



Laplace, Pierre Simon de, solves the 

 problems of universal gravitation, 

 15; completes Herschel's nebular 

 hypothesis, 15, 16; his theory of 

 Saturn's rings, 50 ; how he ac- 

 counted for the moon's acceleration, 

 50 ; how he accounted for aerolites, 

 158; opposes Fresnel's undulatory 

 theory of light, 203. 



Lartet, Edouard, his important find in 

 the caves of Dordogne, 113. 



467 



