INDEX 



857 



Skin and iair, correlation of color of, 

 261. 



Skull, variation of, in man, 46; cubic 

 concents of, no absolute test of in- 

 tellect, 80; Neanderthal, capacity of 

 the, 81; causes of modification of 

 the, 81; difference of, in form and 

 capacity, in different races of men, 

 225; variability of the shape of the, 

 232; differences of, in the sexes in 

 man, IIT-VIS; artificial modification 

 of the shape of, 140. 



Skuak, odor emitted by the, 683 ; white 

 tail of, protective, lOl. 



Slavery, prevalence of, 159 ; of women, 

 163-764. 



Slaves, difference between field- and 

 house-, 260. 



Sloth, ornaments of male, 690. 



Smell, sense of, in man and animals, 

 36-3T. 



Smith, Adam, on the basis of sympa- 

 thy, 14S. 



, Sir Andrew, on the recognition 



of women by mals Oynooephali, 25 ; 

 on revenge by a baboon, 100; on 

 an instance of memory in a baboon, 

 105 ; on the retention of their color 

 by ttie Dutch in South Africa, 256 ; 

 on the polygamy of the South Afri- 

 can antelopes, 281; on the polygamy 

 of the lion, 288; on the proportion of 

 the sexes in Kobus ellipsiprymnus, 

 325; on Bucephalus eapensis, 451; 

 on South African lizards, 463; on 

 fighting gnus, 647 ; on the horns of 

 rhinoceroses, 653 ; on the fighting of 

 lions, 672 ; on the colors of the Cape 

 eland, 692 ; on the colors of the gnu, 

 692 ; on Hottentot notions of beauty, 

 745; disbelief in communistic mar- 

 riages, 751. 



, P., on the Cynipidse, and Ten- 



thredinidae, 335; on the relative 

 size of the sexes of Aculeate Hy- 

 menoptera, 367 ; on the difference 

 between the sexes of ants and bees, 

 383-384 ; on the Btridulation of Trox 

 sabulosus, 396; on the stridulation 

 of Mononychus pseudacori, 398. 



Smynthurus luteus, courtship of, 868. 



Snakes, sexual dififerences of, 456-457 ; 

 mental powers of, 457 ; male, ardency 

 of, 457. 



"Snarling muscles," 64. 



Snipe, drumming of the, 488; colora- 

 tion of the, 684. 



, painted, sexes and young of, 



614-615. 



, solitary, assemblies of, 523. 



Snipes, arrival of male before the fe- 

 male, 280; pugnacity of male, 469; 

 double moult in, 504. 



Snow-goose, whiteness of the, 636. 



Social animals, affection of, for each 

 other, 140; defence of, by the 

 males, 146. 



Sociability, the sense of duty connected 

 with, 135-136; impulse to, in ani- 

 mals, 144; manifestations of, in 

 man, 148; instinct of, in animals, 

 i50. 



Sociality, probable, of primeval men, 

 91 ; influence of, on the development 

 of the intellectual faculties, 113 ; ori- 

 gin of, in man, 114. 



Soldiers, American, measurements of, 

 62. 



and sailors, difference in the stat- 

 ures of, 52 ; difference in the propor- 

 tions of, 64. 



Solenostoma, bright colors and marsu- 

 pial sac of the females of, 450. 



Song of male birds appreciated by their 

 females, 129 ; want of, in brilliant- 

 plumaged birds, 517; of birds, 580- 

 581. 



Sorex, odor of, 683. 



Sounds, admired alike by man and ani- 

 mals, 129; produced by fishes, 451; 

 produced by male frogs and toads, 

 455 ; instrumentally produced by 

 birds, 488 et seq. 



Spain, decadence of, 190. 



Sparassus smaragdulus, difference of 

 color in the sexes of, 359. 



Sparrow, pugnacity of the male, 468; 

 acquisition of the linnet's song by 

 a, 480, 734; coloration of the, 611; 

 immature plumage of the, 601-602. 



, white-crowned, young of the, 



627. 



Sparrows, house- and tree-, 586. 



, new mates found by, 527. 



, sexes and young of, 623 ; learn- 

 ing to sing, 734. 



Spal.hura Underwoodi, 500. 



Spawning of fishes, 444, 448. 



Spear, used before dispersion of man, 

 239. 



