INDEX 



Heineccius, 3. 324, 

 Heliconia and leptalis, 3. 37. 

 Hellenic political system, iii, 320. 

 Helmholtz, H. L. F., l. 58 ; sound, 



3. 182. 



Helvetius, C. A., i. 173. 



Hennell, Sara, 4. 364. 



Herakleitos, universe in a ceaseless 

 flux, 2. 186. 



Heredity, 3. 82, 95 j of instinct, 

 219 ; of intellect, Ixvii, 3. 234 ; 

 and social progress, 344. 



Heretics, 4. 28. 



Herschel, William, Saturn, 2. 282 ; 

 nebulae, 293. 



Heterogeneity, defined, 2. 218 ; in 

 organic evolution, 221, 3. 1045 

 in social evolution, 307, 313. 



Hertz, xliii. 



Hippocrates, 2. 22. 



Historic sense, I. 244, 275. 



History, science of, 3. 245. 



Hobbes, Thomas, I. 35, 172. 



Holbach, P. H. D. Baron von, i. 

 173. 



Homogeneity defined, 2. 218. 



Horse, ancestors of, 3. 60. 



H uggins, William, motion of Sirius, 

 2. 32 ; nebulae, 294. 



Humanity, Comte's religion of, 2. 

 Ill, 4. 239. 



Humboldt, F. H. A. von, primitive 

 religion, 4. 300, 



Hume, David, i. 69, 1065 uni- 

 formity test, 71, 87; scepticism, 

 126, 174; causation, 187, 228. 



Hunt, Sterry, 2. 287 n. 



Hunter, W. W. , religion of Santals, 



4. 299. 



Hutton, R. H., 4. 127. 



Huxley, T. H., on Comte, I. 243, 

 246, 275, 2. 69, 91 ; classifica- 

 tion of species, 388 5 infertility of 

 species, 3. 66 ; age of the earth, 

 69 ; man, 4. 59 n. ; teleology of 

 evolution, 224 n. 



Huygens, Christian, theory of light, 

 I. 28, 191. 



Hybrids, infertility of, Ixi, 3. 63-67. 



381 



Hydra and sense of sight, 3. 132. 

 Hypothesis, its requisites, I. 202, 2. 

 119. 



Idealism, i. 66, 1 07-1 31. 

 Ideational centres, 3. 201, 206. 

 Identity of contradictories, I. 174. * 

 Ignes fatui, 2, 16. 

 Immortality of man, cvii. 

 Inconceivable, ambiguity of the word, 



1. 895 difference between incon- 

 ceivable and incredible, 90. 



Inconceivability-test, xlvii, I. 87, 



2. 146, 3. 237. 



Individual, rights ignored in primi- 

 tive society, 3. 323 j recognized 

 by higher civilization, Ixxi, 3. 

 325 5 in social evolution, Ixxiv, 



3. 332, 4. 19 J in religion, xcviii, 



4. 311. 

 Individuation, 3. 139. 



Industrial civilization and diminu- 

 tion of warfare, Ixiii, 3. 365- 



Infancy, meaning of, viii, Ixxxi, 3. 



^33, 4- 130, 158, 161. 

 Infants, crying of, I. 153. 

 Infinite, nature of the, I. 13, 19. 



See also God. 

 Innate ideas, i. 66, 148, 169. 

 Inorganic physics, how divided by 



Comte, 2. 9. 

 Instinct, inheritance of, Ixvii, 3. 219, 



223. 

 Integration, 2. 199, 229, 3. 103 j 



defined, 219. 

 Intelligence, man's acquisition of, 4. 



98. 

 Intuitional knowledge, 3. 236. 

 Isaiah, prophet, quoted, 4. 163. 



Jacobism, rise of, 4. 325, and social 



dissolution, 331. 

 James, William, composition of 



mind, 3. 191 n. 

 Joule, J. P., I. 50, 2. 26. 

 Julian, Emperor, 4. 329, 346. 

 Jupiter, planet, 2. 281. 

 Jurisprudence, 2. 53. 



