Index. 399 



Sexual selection, Darwin's hypothesis of, ;il-41 ; its place in evolution, 1-ls, 281); 

 how it oi)erates, 2'JO ; in iliiniicry, 308-30;». 



Skilton, James A., on Herbert Si)encer, 19-21; on vegetal evolution, l.'{5; on evo- 

 lution of society', 2();j-i;i'T. 



Social Statics, when pulilished, 5; 3Ir. Spencer's dissatisfaction witli it,r>, 20, 

 229; principle set forth in it, 2;i0. 



Socialism, 380. 



Societary evolution, 203-230. 



Society ;ui ()rj;anism, 217, 278, and note. 



Sociolofiiial St-ctiou of Birmingham, Eng., Nat. Hist. Society, letter from, re- 

 cognizfd, .'i'.U. 



Sociologv, I'rinciples of (see " Principles of Sociology"). 



Solar and jilanetary evohition, 55-75. 



Special senses, evolution of, 18G. 



Spencer Herbert, his life and works, 3-22 ; letter from, 19 ; the most notable ad- 

 vocate of evolution before Darwin, 32; his early essay on development, :« ; 

 his reeejition of Darwin's Origin of Species, 40; his sociological tables, l.iii; 

 his coiitrilmtion to the theory of evolution, 142; relation of his philosojiliy 

 to the doctrine of the correlation of forces, 180 ; his psychology, 181, 180, 187, 

 188, 189, 190, 199 ; doctrine of the Unknowable, 181, 249, 2.50 vote, 251, 331-334, 

 350-a53, 364-305 ; his criticism of Romanes, 185; his ethics, 195, 259 -261, 20C, 

 268-280; his sociology 203, 204, 217-223, 228, 229,230; on the temporary 

 nature of government, 230; on ancestor-worship, 235, 237-239; on m>'th- 

 making, 240; his definition of life, 266 tiofc; on design, 312; his religious 

 views criticised, 329-334; his ])hilosoi)hy, 348, 350, 353; his doctrine of the 

 interdependeucy of mind and matter, 363. 



Spencer, Rev. Thomas, 4. 



Spiritualism and materialism com])ared, 3.54- 365. 



Spontane.ius generation, 125-126, 140, 199, 309-310, 315. 



State socialism, judged by evolution, 380-381. 



Stevens, I'r if. W. Le Conte, on geological evolution, 104-107. 



Stratified rocks, formation of, 84. 



Study of Sociology, 194, 203, 229. 



Sympathetic origfn of altruistic feeling, 194-195, 267. 



Taylor, JOHX A., on the evolution (jf so(;iety, 229 ; on the effects of evolu- 

 tion on civilization, 388-389. 



Tennyson, Alfred, his glorification of war, 360. 



Tcut<"ini(; uivlliologies, in lli('oloi:Jcal evolution, 242. 



Theism, as rclatetl to evolution, 16-17, 22, 46, 103, 107, 13.3-134, 14;{, 1.54, 1.56-1.57, 

 216, 228. 2;;;^25o. 



Theologv, lOvoluiion of, 233-2.53. 



Theory of jiopulation, 5, 20, 21, 148,172-173, 208-212, 260-261, 263-264. 



Thonijison, Daniel Oreeiikaf, on Herbert S)iencer, 3-18. 



Thomson, Sir William, iii.> theory of the iiu tcoric origin of life, 169. 



Tolstoi, Count Lvof X., his social ideal. .■;70-371, 373, 378. 



Trans<<MLilentalisni, as related toevoluticm, 327, 346-347. 



Trcviianus, an early advocate of evolution, 32. 



Tvndall, I'rol. .lohii, his intiniacv with Herbert Spencer, 8; on matti'r and life, 

 310. 



Unknowablk, Spencer's doctrine of, 16-17, 22; the doctrine criticised, 49-50, 

 199, 227,3.50-3,53; the i)rinciple, as stated by William J'otts, 133; by Dr. 

 Eccles, 181-182,390; by Z. S. Sampson, 249-250; as related to religion and 

 science, 331-334; to philosophy, 3.50-,'353, 364; the philosophical basis of 

 monism, 365. 



Uniformity, the doctrine of, 95, 344-346. 



Utopia, More's, 369. 



Van dkr Rroek, Prof. T. H., his advocacy of evolution in Holland, 51. 



Yan der Weyde, Dr. P. H., on Darwin, .50-51 ; on the nebular hypothesis, 7.;; on 

 Darwin's letter, 157 ; on ])hysics and metaphysics, 283. 



Variations, artificial, .33; as stated bv Darwin, 35; in plant-life, 115-lls; in ani- 

 mal life, 147-148, 1.51-154; origin of, I64-l(;6. 



Vedas, 242. 



Vegelalile mould, the formation of, 29. 



Vegetal life, evolution of, 111-1.36. 



Virchow, I'rof., his opposition to Darwinism, 17.3. 



Vestiges of Creation, 32, 51, 



Vogt, Prof. Carl, on vegetal evolution, 131; on missing links, .305. 



Volcanic Islands. 29. 



