atigue, 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

Jost's law, 142

Language and thinking, 170 ff.

Language study, 144

Latin, 116

Law, service of psychology to, 212

Learning and remembering, 138

Learning by wholes, 141

Life occupations, 205

Logical memory, 184 ff.

Meaning, 163 ff.

Medicine, 211

Memories, kinds of, 132

Memory, 124 ff.;
and age and sex, 127;
and habit, 146;
and school standing, 135;
and thinking, 134;
factors of, 128 ff.;
good, dangers resulting from, 137;
kinds of, 132

Mendelian principle, 26

Mental development, 19

Mental differences, 178;
detection of, 180;
importance of, 201 ff.

Mental functions developed, 182

Mental set, 157

Mental tests, 183 ff.

Mind and body, 34 ff.

Mood, 78

Moral training, 117 ff.

Motive, 77

Muscular speed, 14

Museum, school, 62 ff.

Musical ability, 179

Nearsightedness, 44

Needs of child, 77

Nerve tendency, 92

Norms in mental tests, 184 ff.

Occupations, 205

Opposites test, 195 ff.

Organization of experience, 163 ff.

Pain sense, 42

Parents, and habit-formation of children, 104 ff., 119

Perception, 124

Physiological basis of memory, 126

Piano playing, 51, 97

Pitch, 41

Plasticity, 93

Play, 68

Pleasure and habit, 101

Pleasure, higher f