340 



THE PLAY OF ANIMALS. 



Singing mouse, 274. 



Singing thrush, 108. 



Siskin, 86, 110, 221, 260. 



Smitt, orang-outang, 117. 



Snipe, 260, 270, 275, 281. 



Sotheby, on talking canaries, 198. 



Souriau, play as instinct, 13; as 

 practice, 22 ; movements of young 

 animals, 288, 296; pleasure in 

 activity, 290 ; end of play, 289. 



Spalding, instinct in chickens, 

 swallows, and cats, 42; sparrow, 

 81, 104, 139, 221, 255. 



Speckter, 185. 



Speech, 197. 



Spencer, play, 1, 5, 13, 21, 234, 287 ; 

 survival of the fittest, 45, 231 ; in- 

 heritance of acquired characters, 

 51, 60 ; on instinct, 62, 66 ; imita- 

 tion, 78, 181, 206 ; sexual selection, 

 231 ; love plays, 245, 280 ; freedom, 

 291. 



Spengel, 56. 



Spider, 265. 



Squirrel, 284. 



Starling, 145, 201. 



Steinen, 309. 



Steinthal, 15. 



Stiebeling, 107. 



Stork, 104, 128, 261, 282. 



Strange, 160. 



Strieker, imitation, 78, 178. 



Suggestion, 213 ; hypnotic, 304,312. 



Sully, on Schiller, 3; Weismann, 

 51 ; imitation, 78 ; causality, 290. 



Swammerdam, water snail, 39. 



Symmetry of coloring, 232, 235. 



Tape, on geese, 106. 



Tapir, 113. 



Tarde, imitation, 207. 



Tennent, curiosity, 219 ; elephants, 



298. 

 Tetrao phasianellus, 264. 

 Tetrao umbellus, 151. 

 Thistle finch, 110, 272, 280. 



Thrush, 200, 277, 280. 

 Tiger, 141. 

 Titmouse, 110. 

 Toucan, 139. 



Toussenel, swallows, 177. 

 Tschudi, 112, 215, 279, 280. 

 Turkey cock, 286. 

 Tylor, on selection, 231. 



Van Bemmelen, on inheritance of 



acquired characters, 56. 

 Vanity, 248, 253. 

 Virchow, 56. 

 Viscacha, 157, 218. 

 Vogt, on instinct, 35. 

 Voice practice, 97. 

 Vosmaern, 93. 

 Vulture, 96, 148, 220. 



Wallace, on instinct, 33, 56, 64 ; on 

 birds, 33, 72, 194 ; selection, 232, 

 238, 241 ; love plays, 235, 271. 



Wallaschek, 3; imitation, 5, 12; 

 selection, 231. 



Walter, 129. 



Waltz, 265. 



Ward, 55. 



Wasmann, on instinct, 29; ants, 

 58. 



Water ouzel, 280. 



Water rat, 258. 



Water shrew, 284. 



Waterhouse, 274. 



Weasel, 103, 106. 218. 



Weaver bird, 156. ■ 



Wcinland, 43; on birds, 102, 193, 

 195; raccoon, 217. 



Weir, on birds, 153, 272. 



Weismann, 31, 71 ; selection, 46, 

 50, 230 ; ants, 57 ; birds, 272. 



Whistling shrike, 278. 



Whitethrcat, 108. 



Wied, Prince von, 278. 



Willow wren, 151. 



Wilser, 48, 51. 



Wodzicky, the bittern, 282. 



