_Subnormal._ Having characteristics considerably below the normal. _Tendency._ Probability of a nerve-current taking a certain direction due to nerve-organization. _Thinking._ The passing of images and ideas. _Thought._ Thinking; an idea or group of ideas. _Training._ Establishing nerve connection or bonds. _Vividness._ Clearness of sensations, perceptions, images, and ideas. INDEX Abilities, specialized, 179 Ability, unusual, 206 Adaptation of vision, 41 After-images, visual, 40 Ancestors, 22 f. Anger, 58 Appearance of instincts, 54 Applied psychology, 8-9, 210 ff. Association of ideas, 152 Astigmatism, 44 Attention, 80 ff.; and will, 82. Attitude, 157 Behavior, 7 Bodily conditions, 76 Brain, 7 Brightness, sensation of, 38 Business, 215 Causality, 18, 21 Centrally initiated action, 51 Child, nature of, 11 Cold, sense of, 42 Collecting instinct, 62 College, function of, 217 Color blindness, 45 Color mixture, 39 Color, sensation of, 38 Completion test, 198 Concentrated practice, 102 Consciousness, 7 Conservatism, 109 Costly Temper test, 186 Cramming, 141 Criminal, the, 213 f. Curriculum, 145 Darwin, 89 Defects of sense organs, 43 Development, individual, 24 ff.; racial, 18-21; significance of and causality, 21-24 Direct method, 112 Dizziness, organs that give us sense of, 42 Dramatization, 67 Drill in school subjects, 110-112 Dynamic, world as, 20 Economical practice, 101 ff. Education, 210; aim of, 10; preparatory, 167; science of, 9 ff. Educational inferences, 143 Educational psychology, 9 ff. Efficiency, 98, 108 Emotions, 74 ff. Environment, 31 Environmental instincts, 61 Envy, 58 Evolution, 19 ff. Exceptions, 101, 114 Excursions, 61 Experience, 8; organization of, 169 Experiment, 13 ff. Eye, the, 37 Eye defects, 43 ff. Eyestrain, 20 Farsightedness, 44 Fatigue, 101 Fear, 56 Feeble-mindedness, 29 Feeling, 73 ff. Fighting instincts, 58 Formal drill, III, 112 Free association frequency surface, 178 Free association test, 193 Frequency of experience, 156 Gang instinct, 60 Genetic view of childhood, 24 Genius, 31 Habit, 87 ff.; and nerve path, 91; how formed, 98 ff.; importance in life, 107; intellectual, 89; moral, 90; of thought, 169; results of, 94; specific, 116 Hearing, 41; defects of, 45 Heredity, 24 ff. Heredity _vs._ Environment, 31 Heritage, social, 23 High school and fourth grade abilities compared, 203 High school, function of, 217 Home and moral training, 118 Idea, 52 Ideas, 124 Imitation, 64 ff. Imitation in ideals, 67 Incidental drill, 111 Individual development, 24 ff. Individual differences, 176 ff. Individualistic instincts, 56 Industry, 216 Influencing men, 215 Inheritance, 22 Inherited tendencies, 50 ff. Initiative, 113 Instincts, 52 ff.; classification of, 55; significance of, 55 Interest, 84 Intervals between practice, 102 Jealousy, 58 Joints, sense organs in, 42