INDEX 



Acquisitiveness, 165. 



Adaptation of sense organs, 211. 



Addison, on instinct, 27. 



^Elian, imitation in monkeys, 184. 



/Esthetic pleasure, 162, 223, 231. 



Alix, on the origin of reflexes, 65; 

 instinct and intelligence, 69 ; play 

 of animals, 83 ; experimentation 

 by a dog, 91 ; coasting by a dog, 

 115 ; climbing by a gibbon, 119 ; 

 chasing by a dog, 125 ; a musical 

 dog, 189 ; Drongo paradisier, 200 ; 

 deception in a dog, 297, 305. 



Allen, Grant, on Schiller, 3. 



Alt, 326. 



Altum, 24. 



Animal friendship, 171. 



Anschutz, curiosity of horses, 217. 



Ants, chasing plays, 130 ; fighting 

 plays, 140. 



Ant-eater, 137. 



Antelope, courtship play of, 254. 



Apparent I or play ego, 305 ft'. 



Apperception, 214, 227. 



Aquatic birds, teaching, 106 ; court- 

 ship, 262. 



Attention, 214, 227. 



Audubon, carrier pigeons, 181 ; love 

 plays of night hawk and mocking 

 bird, 259 ; song of the cardinal, 

 277. 



Autenrieth, on caterpillars, 41. 



Azara, execution by rats, 209 ; the 

 oscilador, 258. 



Badger, 106, 107, 113, 122, 138. 



Bain, on instinct, 32 ; on the move- 

 ments of a newborn lamb, 33, 

 78. 



Baldamus, on the night heron, 150. 



Baldenstein, on vultures, 96, 148. 



Baldwin, J. Mark, Editor's Preface ; 

 on walking reflex, 44 ; on the in- 

 heritance of acquired characters, 

 56, 64 ; on heredity and instinct, 

 61 ; instinct and intelligence, 71, 75, 

 78; self-exhibition, 166 ; observa- 

 tion of mocking birds, 197, 277; im- 

 itation, 207 ; organic selection, 239, 

 Appendix ; make-believe, 301. 



Baltz, nursing play among cats, 174. 



Barrington, bird song not inherited, 

 72. 



Baschkirtzew, divided conscious- 

 ness, 316. 



Bastard nightingale, 159. 



Bates, fighting plays of ants, 141. 



Bateson, on selection, 64. 



Baya-bird, 159. 



Bear, experimentation, 87; move- 

 ment play, 113 ; tussling, 142 ; 

 imitation, 191. 



Bearded titmouse, 110. 



Beauty, animals' feeling for it, 162, 

 168, 230, 240 ; divided conscious- 

 ness in sense of, 319 ; relation to 

 decoration, 327. 



Beckmann, on raccoons, 89, 137, 143 ; 

 chasing play of a badger, 129. 

 333 



