Index 



287 



Eyes, of dancer, 3; opening of, 24; 

 retina of, 177. 



FEAR, in dancer, 45. 



Females, designated by odd num- 

 bers, 3, 102; dancing of, 34, 36; 

 voice of, 75. See Sex. 



Fighting of dancers, 20. 



Figure-eight dance, 32. 



Filters for obtaining colored light, 



I5I-I55- 



Food of dancer, 19, 20. 

 Form discrimination, 179, 182. 

 Frog, reactions of, 81; repetition of 



act by, 205. 

 Functions of eye, 177. 



GALTON whistle, 74, 76. 

 Gestation, period of, in dancer, 21. 

 Gray papers, 113. 

 Green-blue tests, 147, 158. 

 Green-red tests, 163. 

 Grouping for averages, 237. 

 Guaita, G. von, breeding experi- 

 ments with dancers, 13, 14. 



HAACKE, W., description of dancer, 

 i; origin of dancer, 8; breeding 

 experiments, 13. 



Habit, of dancing, 40; discrimina- 

 tion, 147; useless, 106, 205; laby- 

 rinth, 210; duration of, 251; 

 reacquisition of, 256; relations of, 

 262. 



Habit formation, and the senses, 196; 

 versus habit performance, 197; in 

 the dancer and in the common 

 mouse, 212; curves of, 217, 231, 

 235 ; speed of, 234. 



Habituation to sounds, 90. 



Hacker, dancing shrews, n. 



Hair, appearance of, 22. 



Hamilton, G. V., experiments with 

 dog, 225. 



Hatai, S., the dancer, 7, 8. 



Head, shape of, in dancer, 2, 49. 



Hearing, in dancer, 62, 73; in young 



78; in adult, 90; methods of test- 

 ing, 79; in frog, 81. 



Hefner unit of light, 121. 



Heredity, 90, 278. See Inheritance. 



Hering, E., colored papers, 139. 



History, of dancer, i; of acts, 206. 



Hunger as motive in experiments, 98. 



Hybrid dancers, 13. 



t 



IMITATION in dancer, 206209. 



Index of modifiability, 237, 248, 261, 

 272. 



Individuality, 49, 61, 197, 199, 206, 

 215, 221, 234, 254, 264, 277. 



Inheritance, 9, 13, 37, 68, 90, 278. 



Inhibition of an act, 130. 



Initiative of dancer, 200, 264, 268. 



Insight of dancer, 234. 



Intelligence, 206; measures of, 210, 

 227; comparisons, 234. 



Interrupted circuit for experimental 

 use, 94. 



Irregular labyrinths, 222. 



JANSSEN- Hoffman spectroscope, 155. 

 Japan, dancers in, 5, 7. 

 Judgment in dancer, 131. 



KAMMERER, P., dancing wood mice, 



10. 

 Kishi, K., dancer in Japan, 5; origin 



of race, 9; equilibration, 45; 



blinded dancer, 48; structure of 



ear, 59, 63, 64-69; wax in ears, 74; 



tests of hearing, 77. 

 Konig tuning forks, 84; steel bars, 87. 

 Kreidl, A. See Alexander. 



LABYRINTH, forms of, 210; labyrinth 

 A, 211, errors in, 211, tests in, 213; 

 labyrinth B, 184, tests, 216; laby- 

 rinth C, 219, 221; labyrinth D, 

 222, 224; a standard labyrinth, 

 224; regular and irregular laby- 

 rinths, 222. 



Labyrinth errors and individual ten- 

 dencies, 225. 



