530 



INDEX. 



Hertz, electro-magnetic theory of 

 light, 156; theory of electricity, 

 162. 



Hess, 115. 



Hildebrand, 74. 



Hill, Alexander, quoted, 304, 452, 462. 



His, 298, 414 ; development of nerve- 

 cells, 306 ; Unsere Korperform 

 (1875), 378. 



Hisinger, 127. 



Hitzig, 304, 310. 



Hoche, on Neuron-Theory, 309. 



Hodge, fatigue of nerve-cells, 308. 



Hofacker and Sadler, 392. 



Hofer, 315. 



Hoffmann, 253. 



Hofmann, 98, 103, 104. 



Hofmeister, 338, 356, 359. 



Holcombe, 155. 



Homogeny and homoplasty, 338. 



Homology, 337, 374. 



Hopkins, 235. 



Hoppe-Seyler, 300. 



Horsley, 304, 310. 



Huggins, Sir William, 186, 196, 218 ; 

 quoted, 196, 200, 221, 222 ; origin 

 of nebulae, 223 ; spectroscopy, 

 219 ; stellar spectroscopy, 217. 



Hugi, 260. 



Humboldt, Alexander von, 89, 205, 

 252, 254, 277 ; on the influence of 

 the environment, 610. 



Hutchins, 216. 



Hutton, 226, 230, 241, 257; quoted, 

 231 ; earth-sculpture, 250. 



Huxley, 335, 358, 427 ; quoted, 140 ; 

 germ-layers, 374 ; palaeontology, 

 345 ; physical bases of life, 287, 

 316. 



Hyatt,350. 



Hybridisation, 394. 



Hybrids, 410. 



Hydrosphere, of the earth, 276. 



Hypothesis, 178. 



I. 



Ice- Ages, recognition of, 259; causes 



of, 265. 



Idiosomes, 361. 



Immortality of Protozoa, 395. 

 Immunity, 420. 

 Impact-theory, 211. 

 Imperfection of geological record, 



349. 



Imponderable matter, 142. 

 In-breeding, 394, 440. 

 Indestructibility of matter, 114. 

 Inertia, 174. 

 Inheritance, 397. 

 Inheritance, ancestral, 411 ; blended, 



407 ; dual nature of, 404 ; mul- 



tiple, 405, 409 ; particulate, 407 ; 

 physical bases of, 889, 440 ; so- 

 cial, 415 ; unilateral, 405. 



Inheritance, degrees of complete- 

 ness in expression of, 405. 



Inheritance of acquired characters 

 or modifications, 412. 



Inheritance, of fecundity, fertility, 

 and longevity, 406. 



Instinct, 456. 



Integration, 340. 



Internal secretions, 296. 



Inter-relations of things, 15, 277. 



louisation theory, 129. 



Ions, 119, 129. 



Irmisch. 338. 



Isolation^ a factor in evolution, 438. 



Isomerisrn, 100. 



Isomorphism, 274. 



Isotherms, 277. 



J. 



Jaeger, 402, 404, 493. 



Jahn, 120. 



James, Alex., cell-division, 362. 



Janssen, 206. 



Jenkin, Fleeming, 439. 



Jennings, behaviour of Protozoa, 459. 



Joly, 245 ; age of the earth, 238. 



Joule, 93, 139, 146, 170 ; on light, 154 ; 

 mechanical equivalent of heat, 

 114, 140; velocity of particles of 

 a gas, 147. 



E. 



Kant, 400, 412. 



Katabolism. 320. 



Keane, on man's inter-glacial 

 origin, 479 ; on races of man- 

 kind, 484 ; on classification of 

 human races, 485. 



Keasbey, on origin of human soci- 

 ality, 517. 



Kekule, 104. 



Kelvin, Lord, 210; age of earth, 237, 

 242 ; dissipation of energy, 139 ; 

 grained structure of matter,172 ; 

 theory of Vortex-Atoms, 167. 



Kestner, 101. 



Kielmeyer, 376. 



Killian, tonsils, 299. 



Kinetic theory of gases, 68, 93, 147, 

 170. 



Kirchhoff, 217. 



Kirchhoff's law, 211, 315. 



Klaproth, 94, 98. 



Klebs, experiments, 394. 



Kleinenberg, 341. 



Knee-jerk, an example of pure reflex, 

 463. 



