783 INDEX. 



Secondary sexual characters, 234; relations of polygamy to, 245, 

 transmitted through both sexes, 255; gradation of, in birds, 488. 



Sedgwick, \V., on hereditary tendency to produce twins, 51. 



Seemann, Dr., on the different appreciation, of music by different 

 peoples, 650; on the effects of music, 651. 



Seidlit/, on horns of reindeer, 577. 



SelaspJiorus platycercus, acuminate first primary of the male, 429. 



Selby, P. J., on the habits of the black and red grouse, 248. 



Selection, as applied to primeval man, 32; double. 255; injurious 

 forms of, in civilized nations, 152; of male by female birds, 459, 477; 

 methodical, of Prussian grenadiers, 32; sexual, explanation of, 236, 

 241, 249; influence of, on the coloring of Lepidoptera, 363; sexual 

 and natural, contrasted, 256. 



Self-command, habit of, inherited, 131; estimation of, 134. 



Self -consciousness, in animals. 93. 



Self-preservation, instinct of, 17. 



Self sacrifice, by savages, 126; estimation of, 134, 



Semilunar fold, 19. 



Semnopithccus* 175; long hair on the heads of species of, 171, 

 689; semnopithecus chrysomelas, sexual differences of coior in, 614; 

 semnopithecus cotnatus, ornamental hair on the head of, 627; semiiopi- 

 theeus frontatus, beard, etc., of, 629; semnopithecus nasica, nose of, 

 171; semnopithecus nemceus. coloring of, 629; semnopithecus rubicuii* 

 dun, ornamental hair on the head of, 625. 



Senses, inferiority of Europeans to savages in the, 38. 



Sentinels, among animals, 114, 121. 



Serpents, instinctively dreaded by apes and monkeys, 75, 80. 



fierranus. hermaphroditism in, 184. 



Setina, noise produced by, 349. 



Sex, inheritance limited by, 260. 



Sexes, relative proportions of, in mar,, 274, 636; proportions of, 

 sometimes influenced by selection, 288; probable relation of the, in 

 primeval man, 674. 



Sexual and natural selection, contrasted, 256; characters, effects of 

 the loss of, 261; limitation of, 262; characters, secondary, 234; rela- 

 tions of polygamy to, 245; transmitted through both sexes, 255; 

 gradation of. in birds, 488. 



Sexual differences in man, 8; selection, explanation of. 236, 241, 

 249; influence of, on the coloring of Lepidoptera, 363; objections to, 

 563; action of, in mankind, 679; selection in spiders, 307; selection, 

 supplemental note on, 709; similarity, 288. 



Shaler. Prof., sizes of sexes in whales, 538. 



Shame, 129. 



Sharks, prehensile organs of male. 375. 



Sharpe, Dr., Europeans in the tropics, 223. 



Sharpe, K. B., on Tanysiptera sylxia, 514; on Ceryle, 520; on the 

 young male of Dacclo Gaudichandi, 532. 



Shaw, Mr., on the pugnacity of the male Salmon, 377. 



Shaw, J ., on the decorations of birds. 434. 



Sheep, danger-signals of. 114; sexual differences in the horns of, 

 260; horns of, 266, 576; domestic, sexual differences of, late devel- 

 oped, 269; numerical proportion of the sexes in, 279; inheritance of 

 Jiorns by one sex, 570, effect of castration, 577; mode of fighting of, 



