INDEX. 



Peacock, 252, 269, 281. 



Pechuel-Loesche, on apes, 76, 92, 

 119, 163, 226 ; on a ram, 147. 



Pcreira, animals as automata, 26. 



Philostratus, on apes, 184. 



Pierquin de Gembloux, a musical 

 dog, 189. 



Pietruvsky, on the raven, 177. 



Plato, 79. 



Play of animals, 1, % 13, 23, 49, 72, 

 287 ; social, 74, 99, 178, 294, 325. 



Polar bear, 87, 90, 142, 191. 



Pouchet, 69. 



Praxiteles, 265. 



Preyer, instinct, 43, 48; make-be- 

 lieve, 79 ; experimentation, 85, 

 88 ; cruelty, 135. 



Puma, 86, 125, 134, 141. 



Kaccoon, 90, 137, 143, 217. 



Raffles, on the leopard, 122. 



Rat, execution, 209. 



Red wagtail, 270. 



Redstart, 129. 



Reedbird, 256, 266. 



Reimarus, on instinct, 25, 29, 38. 



Rengger, on monkeys, 97, 118, 137. 



Rey, parrots, 95 : sparrows, 221. 



Ribot, on instinct, 25, 48 ; on Weis- 

 mann, 51 ; attention, 214. 



Rivalry, 140, 184, 195. 



Robin, 221. 



Romanes, G. J., instinct, 27, 42, 47, 

 52, 60, 71 ; on play of fishes, 101 ; 

 of dogs, 117; of various birds, 

 159 ; a crazed pigeon, 163 ; mon- 

 key with doll, 189 ; bird-song, 

 196, 200; execution, 210; curi- 

 osity of dogs, 216 ; of fish, 219 ; 

 of insects, 220 ; intelligence of 

 birds, 251 ; the bell bird, 279. 



Romanes, Miss, experiments with 

 apes, 92, 187. 



Routh, on dogs, 191. 



Rupicola crocea, 268. 



Russ, speech of canaries, 197; other 



birds, 198, 201, 203, 206; love 

 plays, 266 ; deception of a parrot, 

 299. 



Satin bower bird, 160. 



Savage, on chimpanzee, 96. 



Saville Kent, dolphins, 138. 



Scarlet shrike, 278. 



Schaeffer, 136. 



Schaller, on play, 15, 18. 



Scheitlin, panther, 86 ; elephant, 

 91 ; hares, 96 ; cranes, 108 ; kit- 

 tens, 122; chasing play of horses, 

 125, 138 ; of stork, 128 ; of Alpine 

 cows, 144; dogs, 187; curiosity 

 of dogs, 216; of goats, 215; of 

 nightingales, 217 ; of siskins, 222 ; 

 dancing of a crane, 263 ; cat con- 

 cert, 274. 



Schelling, on instinct, 30. 



Schiller, surplus energy, 1, 22, 234, 

 287; teleology, 45, 88; play of 

 insects, 100; art and play, 303; 

 beauty, 317, 319 ; freedom, 323. 



Schlegel, on the leopard, 112. 



Schneider, instinct, 14, 48, 56, 65; 

 aim, 67 ; imitation, 77 ; attention, 

 130. 



Schomburgk, 268. 



Schopenhauer, 225. 



Schu berth, on instinct, 30. 



Schweinfurth, courtship of deer, 

 257. 



Schwendt, on parrots, 204. 



Seals, 110, 128, 144, 208. 



Seiffertitz, on cranes, 262. 



Seitz, play of antelopes, 7, 254; 

 movement plays, 113 ; play with 

 prey, 122, 124. 



Selection, 45, 230, 244 ; negative I, 

 effect on play, 76 ; sexual, 230 ; or- 

 ganic, 64, 239, Appendix. 



Self-deception, conscious, 294, 301. 



Self-exhibition, 253, 327. 



Siebeck, dreaming, 309. 



Sigismund, experimentation, 85. 



