INDEX. 



437 



Hobbs's parallelism of society and 

 the human body, 367. 



Homogeneous, change of to hetero- 

 geneous, 3 ; seen in genesis of 

 solar system, 3 ; in phenomena 

 of earth's ci-ust, 5 ; m the ad- 

 vance of life in general, 7 ; in the 

 progress of man, 10 ; in growth 

 of civilization, 12 ; in govern- 

 ment, 13 ; in language, 17 ; in 

 painting and sculpture, 20 ; in 

 poetry, music, and dancing, 24 ; 

 cause of this imiversal change, 

 32. 



Hutton's geological system, 315 ; 

 contrast of the modem with, 318. 



Hydra compared with primitive 

 tribes, 389, 395, 400, 408. 



Hydrozoa, analogies of, 389, 391, 

 400. 



Industrial organization, 373. 



Industrial arrangements, develop- 

 ment of compared with that of 

 the alimentary organs, 398. 



Insensible modifications effect great 

 changes, 367 ; illustrated bv geo- 

 metrical curves, 306 ; by physio- 

 logical development, 370. 



King's councils compared to gan- 

 glia, 409, 411. 



Knowledge, experience the source 

 of all, 126 : relations of various 

 kinds of, 167. 



Language, differentiation of, 17 j 

 origin of written, 18: origin ot 

 verbal, 149 ; origin of emotional, 

 220. 



La Place's theory of planetary evo- 

 lution, 263-265. 



Laughter, common explanations of, 

 194 ; movements in^ 200 ; groups 

 of muscles successively affected 

 in, 201 ; caused by incongruities, 

 203 ; facilitates digestion, 207. 



Law, origin of, 70. 



Likeness and unlikeness, recogni- 



tion of, the basis of classification, 



147 ; the basis of language, 149 ; 



of reasoning, 150 ; of art, 151 ; 



leads to science, 152. 

 Logic, how evolved, 158. 

 Lvell, Sir Charles, criticism upon, 



'326, 330 



M 



Man, progress of, 10. 



Manners, genesis of, 77 ; decline of 

 the influence of, 89 ; conformity in 

 manners leads to extravagance, 

 99 ; conformity in, decreases so- 

 cial mtercourse, 100 ; defeats the 

 true end of social life, 102, 107. 



MathematicSj how evolved, 158. 



Mechanics, rise of science of, 168. 



Mineral qualities of rocks xmtrust- 

 worthy tests of age or position, 

 320. 



Miller, Hugh, estimate of, 340. 



Motion of nebulous matter, 251- 

 253. 



Morality, origin of, 70. 



Muscular movements, cause of, 195; 

 arrested by feeling, 199 ; in laugh- 

 ter purposeless, 201 ; of animals 

 when excited, 211 • variations of, 

 produce changes ot voice, 214. 



Music, uicreasiug heterogeneity of, 

 26; relation of mental to muscu- 

 lar excitement, the source of, 214 ; 

 theory of, 221-224 ; its history 

 confirms the theory, 22^228; 

 negative proof of theory of, 228- 

 231. 



Murchison, Sir R. I., criticism upon 

 his " Siluria," 320, 328, 351, 354. 



N 



Nebula, are they parts of our side- 

 real system ? 243j 249 ; condensa- 

 tion of, 250 ; motion in, 251 ; sig- 

 nificance of forms of, 254 ; struc- 

 ture of spiral, 254. 



Nebular hypothesis, 3, 34 ; its high 

 derivation, 239 ; it explains comet- 

 ary phenomena, 262. 



Negative facts in geology, small 

 value of, 360-363. 



Nervous system, effects of excite- 

 ment in, 195; directions of dis- 

 charge of excitement in, 197; 



