INDEX 



ABNORMAL dancers, 277. 



Acquired forms of behavior, 281. 



Act, useless, repeated, 106, 205. 



Activity, periods of, 34. 



Affirmation, choice by, 131. 



Age, peculiarities, 264, 269; maxi- 

 mum age, 270; and intelligence, 

 272. 



Albino cat, 65; dog, 32. 



Alexander and Kreidl, young dancer, 

 21, 23; behavior, 30, 42; tracks 

 of mice, 44; behavior in cyclostat, 

 46; behavior of white mouse and 

 dancer, 48 ; structure of ear, 58-65 ; 

 deafness, 76. 



Allen, G. M., drawing of dancer, 3; 

 heredity in mice, n. 



Alleys, width of, in labyrinths, 214. 



Amyl acetate for photometry, 121. 



Anatomy of dancer, 52. 



Animals, education of, 200. 



Appuun whistles, 79. 



Audition. See Hearing. 



Averages, dangers in, 274. 



BAGINSKY, B., model of ear of dancer, 



58, 59, 63, 67. 

 Bateson, W., breeding experiments, 



13, J 4- 



Behavior, of dancer, 5, 29; inherit- 

 ance of, 37, 278; when blinded, 

 42, 47; equilibration, 42; dizzi- 

 ness, 45; structural bases of, 52; 

 of young, 22; changes in, 21, 85; 

 useless acts, 106, 205; under ex- 

 perimental conditions, 129; in in- 

 discriminable conditions, 132; value 

 of sight, 178; in labyrinth experi- 

 ments, 1 88; modifiability of, 199; 

 history of, 206; explanations of, 

 206; individual differences in, 

 264, 277. 



Blinded dancers, behavior of, 42, 47. 

 Blue-orange tests, 140; blue-red tests, 



145, 173; blue-green tests, 170; 



blue-green blindness, 172. 

 Bradley papers, 133, 140. 

 Brain, structure of, 29, 69, 71. 

 Breeding of dancers, i, 13, 20. 

 Brehm, A, E., "Tierleben," i, 8. 

 Brightness vision, 91 ; preference, 



105; check experiments, 140; 



relation to color vision, 177. 



CAGES for dancfers, 16. 



Candle meter, 156. 



Candle power, 121. 



Cardboards, for tests of vision, 95; 

 positions of, in. 



Care of dancer, 18. 



Castle, W. E., drawing of mouse, 3; 

 cages, 1 6. 



Cat, albino, 65; training of, 200, 228. 



Cerebellum of dancer, 72. 



Characters, acquired, 281. 



Check experiments, 140. 



China, dancers of, 5, 14. 



Choice, exhibition of, 96; by affir- 

 mation, 131; by negation, 131; 

 by comparison, 131; methods of, 

 200, 234. 



Circling, a form of dance, 32. 



Circus course mice, 2. 



Cleghorn, A. G., 2. 



Climbing of dancer, 42, 269, 277. 



Cochlea, functions of, 61. 



Color blindness, 169. 



Color discrimination apparatus, 134, 



151- 



Colored glasses, 151, 155. 

 Colored papers, 133, 139, 140. 

 Color patterns of dancers, i, 4. 

 Color vision, problem, 91, 177; 



methods of testing, 133, 137, 151; 



285 



