Traits, native and acquired,
89-102
Transfer,
316-317, 361-362
Trial and error,
112, 305, 309, 311, 313, 315, 335, 392, 409, 424, 426, 430, 462-465, 526
Typewriting, learning of,
324-325, 411-412, 518, 525-526, 537
Unconscious, activity,
265-266, 383-384, 506-508, 525-526, 562-565;
emotion, 118-119;
feeling, 172;
motive, 565-569;
retention, 348-349, 562