782 INDEX, 



Secondary Rexual characters, 284; relations of jwlygainy to, 245, 

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



iSedgwick, VV., on her.'ditary tendency to pnxluce twins, 51. 



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

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



Seldlitz, on horns of reindeer, 577. 



JSeUmp/iorutf platycereuti, acuminate first primary of the male, 429. 



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



Selection, as applied to primeval man, 'A2; 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, 127. 



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



Semilunar fold, 19. 



iSemnopitheeux, 175; long hair on the heads of species of, 171, 

 689; semnopithecuit chrymymdas, sexual differences of color in, 614; 

 semnopithtcuH a/inatuH, ornamental hair on the head of, 627; nemnopi- 

 thecus frontatug, beard, etc., of, 629; tiemnopithecnit nadca, nose of, 

 171; semnopithecus nemomis, coloring of , 629; gemnopithecus rubicMn- 

 duM, 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. 



SerranuH, hermaphroditism in, 184. 



Setina, noise produced by, 349. 



Sex, inheritance limited by, 260. 



Sexes, relative proportions of, in man, 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, 588. 



Shame, 129. 



Sharks, prehensile organs of male, 375. 



Sharpe, Dr., Europeans in the tropics, 222. 



Sharpe, R. B., on Tanyidptera sylmn, 514; on Ceryle, 520; on the 

 young male of Dacelo Gaudichaudi, 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 

 horns by one sex, 576; effect of castration, 577; mode of fighting of, 



