INDEX. 



665 



Stephen, Mr. L., on the difference 

 In the mincls of men ana ani- 

 mals, 76; on general concepts in 

 animals, 86; distinction between 

 material and formal morality. 

 107. 



Sterility, general, of sole daugh- 

 ters, 132; when crossed, a dis- 

 tinctive character of species, 162 ; 

 under changed conditions, 184, 

 186. 



Sterna, seasonal change of plu- 

 mage in, 488. 



Stickle-back, polygamous, 216; 

 male, courtship of the, 328; male, 

 brilliant coloring of, during the 

 breeding season, 337; nidMcation 

 of the, 341. 



Sticks used as implements and 



weapons by monkeys, 79. 

 Sting in bees, 204. 

 Stokes, Capt., on the habits of the 



great bower-bird, 376. 

 Stoliczka, Dr., on colors in 



snakes, 348. 

 Stonechat, young of the, 483. 

 Stone implements, diiHculty of 



making, 48; as traces of extinct 



tribes, 177. 



Stones, used by monkeys for 

 breaking hard fruits and as mis- 

 siles, 47; piles of, 175. 



Stork, black, sexual differences in 

 the bronchi of the, 370; red beak 

 of the, 487. 



Storks, 487, 489; sexual difference 

 In the color of the eyes of, 419. 



Strange, Mr., on the satin bower 

 bird, 376. 



Stretch, Mr., on the numerical 

 proportion in the sexes of chick- 

 ens, 242. 



Strepsiceros kudu, horns of, 508; 

 markings of, 538. 



Stridulation, by males of Theridi- 

 on, 270; of the Orthoptera and 

 Homoptera discussed, 286; of 

 beetles, 298. 



Stripes, retained throughout 

 groups of birds, 421; disappear- 

 ance of, in adult mammals, 541. 



Strix flammea, 403. 



Structure, existence of unservice- 

 able modifications of, 59. 



Struggle for existence, in man, 138, 

 142. 



Struthers, Dr., on the occurrence 

 of the supra-condyloid foramen 

 in the humerus of man, 21. 



Sturnella ludoviciana, pugnacity 

 of the male, 363. 



Sturnus vulgaris, 403. 



Sub-species, 171. 



Suffering, in strangers, indiffer- 

 ence of savages to, 114. 



Suicide, 133; formerly not regarded 

 as a crime, 113; rarely practiced 

 among the lowest savages, 114. 



Suidse, stripes of young, 458. 



Sulivan, Sir B. J., on speaking of 

 parrots, 83; on two stallions at- 

 tacking a third, 497. 



Sumatra, compression of the nose 

 by the Malays of, 577. 



Sumner, Archb., man alone cap- 

 able of progressive improve- 

 ment, 77. 



Sun-birds, nidifioation of, 448. 



Superstitions, 141; prevalence of, 

 118. 



Superstitious customs, 93. 



Superciliary ridge in man, 551, 553. 



Supernumerary digits, more fre- 

 quent in men than in women, 

 219; inheritance of, 227; early de- 

 velopment of, 232. 



Supra-condyloid foramen in the 

 early progenitors of man, 156. 



Suspicion, prevalence of, among 

 animals, 67. 



Swallow-tail butterfly, 309. 



Swallows deserting their young, 

 104, 110. 



Swan, black, wild, trachea of the, 

 369; white young of, 477; red 

 beak of the, 487; black-necked, 

 489. 



Swans, 487, 489; young, 475. 



Swaysland, Mr., on the arrival of 

 migratory birds, 208. 



Swifts, migration of, 104. 



Swinhoe, R., on the common rat 

 in Formosa and China, 78; be- 

 havior of lizards when caught, 

 351; on the sounds produced by 

 the male hoopoe, 371; on Dicru- 

 rus macrocercus and the spoon- 

 bill, 454; on the young of Arde- 

 ola, 463; on the habits of Tur- 

 nix, 471; on the habits of Rhyn- 

 chEea bengalensis, 470; on Ori- 

 oles breeding in immature plu- 

 mage, 479. 



Sylvia atricapilla, young of, 482. 



cinerea, aerial love-dance of 



the male, 376. 



Sympathy, 131;' among animals, 

 99; its supposed basis, 103. 



Sympathies, gradual widening of, 

 109. 



Syngnathous fishes, abdominal 

 pouch in male, 158. 



Sypheotides auritus, acuminated 

 primaries of the male, 373; ear- 

 tufts of, 379. 



Tabanidse, habits of, 204. 



Tadorna variegata, sexes and 

 young of, 473. 



vulpanser, 409. 



Tahltians, 141; compression of the 

 nose by the, 577. 



Tail, rudimentary, occurrence of, 

 in man, 22; convoluted body in 

 the extremity of the, 23; absence 

 of, in man and the higher apes. 



