286 



Index 



tests with colored papers, 133-150; 

 tests with ray filters, 151-177; 

 orange-blue tests, 138; yellow-red 

 tests, 139; light blue-orange tests, 

 140; dark blue-red tests, 145; 

 green-light blue tests, 147; violet- 

 red tests, 148; green-blue tests, 

 158; green-red tests, 163; blue- 

 green tests, 170; blue-red tests, 

 173; structure of the retina, 177; 

 conclusions, 176; of different ani- 

 mals, 143. 



Comparative pedagogy, 239. 



Comparison, choice by, 131. 



Cones, lacking in eye of dancer, 177. 



Corti, organ of, in dancer, 54, 65. 



Cotton mouse, 8. 



Curves, of habit formation, 217, 231, 

 233, 235, 273; irregularities of , 232; 

 of labyrinth habit, 236; of dis- 

 crimination habit, 236; of learning 

 and re-learning, 257; of plasticity, 



273- 



Cyclostat, behavior of dancer in, 46. 



Cyon, E. de, dancer pathological, 

 ii ; behavior, 30, 41; behavior of 

 blinded dancers, 47 ; varieties of 

 dancer, 48-50, 56; space percep- 

 tion, 63, 67 ; individual differences, 

 69; anatomy of dancer, 70; hear- 

 ing of dancer, 74-8 1 ; pain cries, 75 . 



DANCERS, occurrence among com- 

 mon mice, 9; varieties of, 49, 277; 

 hybrid, 13. 



Dancing, 2, 5 ; forms of dance move- 

 ment, 32; whirling, circling, figure- 

 eights, manege movements, solo 

 dance, contre dance, 32-33; direc- 

 tion of, 33, 281 ; periods of, 34, 39; 

 amount of, 39; causes of, 31, 70; 

 sex differences in, 34; individual 

 differences in, 277, 278. 



Darbishire, A. D., breeding experi- 

 ments with dancers, 13. 



Deafness of dancer, 53, 61, 73; causes 

 of, 68, 71, 72. 



Descent, lines of, 90, 279. 

 Development of young dancer, 22-28. 

 Differences, individual, 50, 197, 199, 



215, 221, 234, 254, 264; age, 269, 



270; sex, 199, 221, 274. 

 Direction of movement, choice by, 



109. 



Direction of whirling, 33, 281. 

 Discrimination, visual, box, 92; of 



brightness, 95, 132; white-black 



and black-white, 103-109; of 



grays, 115; habits, 147; by odor, 



149; by form, 179; method, 227; 



habit defined, 147, 231. 

 Diseases of dancer, 16, 241, 271. 

 Dizziness, 42, 44-47, 63; visual, 45, 



46; rotational, 46. 

 Docility, 200, 264, 270. 

 Dog, albino, 32; training of, 228; 



fear of electric shock, 225. 



EAR, structure of, 53-71; structural 

 types, 56; model of, 58; of rabbit, 

 54; functions of, 61, 62-72; move- 

 ments of, 77. 



Educability of dancer, 126, 199. 



Education, human, 199; methods 

 of, 239; of vision, 126. 



Efficiency of training, 239. 



Electric-box for visual tests, 92. 



Electric-labyrinth for habit experi- 

 ments, 187. 



Electric-shock as punishment for 

 mistakes, 82, 94, 100. 



Epidemic among dancers, 241, 271. 



Equilibration in dancer, 41-44, 62. 



Error curves, 231, 235; form of, 232. 



Error records versus time records, 

 217. 



Errors, in labyrinths, 184, 210, 211, 

 222; nature of, 223; types of, 222- 

 225 ; value of, 225 ; number of, 223. 



Even numbers to designate males, 3, 

 102. 



Excitability of dancer, 31, 85. 



Experience, value of, 199; influence 

 of, 262, 263. 



