Fear, in dancer Females, designated by odd numbers dancing of voice of _See_ Sex Fighting of dancers Figure eight dance Filters for obtaining colored light Food of dancer Form discrimination Frog, reactions of repetition of act by Functions of eye Galton whistle Gestation, period of, in dancer Gray papers Green blue tests Green-red tests Grouping for averages Guaita, G von, breeding experiments with dancers Haacke, W, description of dancer, origin of dancer breeding experiments Habit, of dancing, discrimination, useless labyrinth, duration of, reacquisition of, relations of, Habit formation, and the senses, _versus_ habit performance, in the dancer and in the common mouse, curves of, speed of Habituation to sounds Hacker, dancing shrews Hair, appearance of Hamilton, G V, experiments with dog Hatai, S, the dancer Head, shape of, in dancer Hearing, in dancer in young in adult methods of testing, in frog Hefner unit of light Heredity _See_ Inheritance Hering, E, colored papers History, of dancer of acts Hunger as motive in experiments Hybrid dancers Imitation in dancer Index of modifiability Individuality Inheritance Inhibition of an act Initiative of dancer Insight of dancer Intelligence, measures of, comparisons Interrupted circuit for experimental use Irregular labyrinths Janssen-Hoffman spectroscope Japan, dancers in Judgment in dancer Kammerer, P, dancing wood mice, Kishi, K, dancer in Japan origin of race, equilibration, blinded dancer, structure of ear, wax in ears, tests of hearing König tuning forks, steel bars Kreidl, A _See_ Alexander Labyrinth, forms of, labyrinth A, errors in, tests, labyrinth B, tests, labyrinth C, labyrinth D, a standard labyrinth, regular and irregular labyrinths Labyrinth errors and individual tendencies Labyrinth habits, Labyrinth method, Labyrinth path, formula, method of recording, Ladder climbing tests, Landois, H, account of dancer, Lathrop, A, dancers, Learning, process, methods of in dancer, by being put through act, by imitation, by rote, rapidity of, permanency of, learning and relearning, curves of, Left whirlers, Life span of dancer, Light, reflected, transmitted, unit of measurement, control of, Litter, size of, in dancer, Lummer-Brodhun photometer.