334 



THE PLAY OF ANIMALS. 



Beckstein, imitation in birds, 201 ; 

 song of nightingale, 276. 



Bell bird, 252, 260. 



Beneke, on the surplus - energy- 

 theory, 2; habits of macropods, 

 102. 



Bennati, musical dog, 189. 



Bennett, the ape's skill in climbing, 

 118 ; propensity for teasing, 137 ; 

 on the duckbill, 142. 



Bezold, nursing play of dogs, 172. 



Binet, on instinct in learning to 

 walk, 43 ; divided consciousness 

 in dreams, 309 ; experiments with 

 hysteria, 313. 



Bittern, pairing call, 282. 



Brehm, A. E., on instinct, 28, 34 

 destructiveness of cockatoos, 95 

 experimentation by puma, 86 

 movement plays of stickleback, 

 100 ; teaching the young, 106 ; on 

 the marten, 111 ; sliding of cham- 

 ois, 114 ; cats' play with victims, 

 122; chase plays of cougar, 120; 

 weasel, 121; cat, 131; dog, 132; 

 ocelot, 134 ; tussling of monkeys, 

 137 ; of ibis, 139 ; of hyena, 142 ; 

 of curly bear, 147 ; fighting of 

 buzzards, 148 ; imitative play, 

 186, 200; voice practice of lions, 

 210 ; curiosity of monkeys, 215 ; 

 of keanastor, 220 ; love plays, 215, 

 258, 263 ; song of finches, 275 ; of 

 scarlet shrike, 277; pairing call 

 of bittern, 282. 



Brehm, Charles L., flight of falcons, 

 105 ; fighting plays of birds, 129, 

 145; imitation, 196, 202; intelli- 

 gence of birds. 251, 254; love 

 plays of birds, 256, 267, 279, 280. 



Brehm, L., experimentation by 

 bears, 87 ; by vultures, 95 ; nurs- 

 ing plays of monkeys, 194; curi- 

 osity of vultures, 222. 



Brooks on the inheritance of ac- 

 quired characters, 56. 



Brunetiere, on positivism, 31. 



Buchner, on instinct, 32, 34, 37, 106; 

 fighting plays of ants, 140 ; nurs- 

 ing plays, 170 ; coquetry of bii'ds, 

 285. 



Bulengerus, on play as recreation, 

 16 ; play of fishes, 100. 



Bulfinch, imitation, 199 ; experi- 

 mentation, 187 ; display of plum- 

 age, 269 ; song of the female, 280. 



Butterfiy courtship, 265. 



Calf, fighting play of, 144. 



Canary, experimentation, 86 ; flight, 

 103 ; swinging, 110 ; learning to 

 sing, 190 ; imitation, 195 ; talking, 

 197 ; curiosity, 223 ; intelligence, 

 252 ; song of female, 280 ; co- 

 quetry, 285. 



Capucin ape, experimentation, 92. 



Cardinal, song, 277. 



Carolina parrot, destructiveness, 95. 



Carrier pigeon, imitation, 181. 



Cartesius. See Descartes. 



Carus, on instinct, 30 ; weaving by 

 birds, 156 ; vanity of birds, 267. 



Cat, play with mock prey, 19, 21, 

 130 ; experimentation, 87, 97 ; 

 movement play, 114 ; play with 

 mice, 121 ; tussling, 141 ; nursing 

 play, 173; imitation, 183; mass 

 play, 208 ; curiosity, 215 ; con- 

 certs, 273. 



Cato, on parrots in Kome, 202. 



Celius, speech in parrots, 203. 



Cerocebus albigena, aesthetic per- 

 ception, 226. 



Chamois, 114, 144, 217. 



Chauna chavarria, voice practice, 

 98, 211 ; flight, 108. 



Chickens, learning to walk, 107 ; 

 imitation, 195. 



Chimpanzee, experimentation, 92; 

 delight in noise, 96 ; imitation, 186. 



Cockatoo, destructiveness, 95 ; imi- 

 tation, 206. 



