ogy, 6-7

Physique, 553

Piano theory of hearing, 234-235

Pieron, 342

Pillsbury, 270, 295

Pintner, 295

Pitch, 229-230, 450

Place associations, 304, 305, 315, 333

Plan, 483, 493, 539-540

Plateau, 322

Play, 139, 148, 151-152, 160, 485-499, 504-505, 517

Pleasantness and unpleasantness, 173-180, 184-185

Poffenberger, 20, 104, 243

Poggendorf illusion, 457, 459

Practice, 177, 298, 304-310, 314-317, 321-327, 360-363, 433, 538;
curve, 307, 316, 321, 325, 390, 542

Preparation for action, 22-25, 72, 74-77, 427-430

Preparatory reactions, 77-84, 111-112, 125-128, 132, 139-140, 145, 147

Prestige, 549

Prince, 559, 564, 569, 571

Problem solution, 385, 465, 469-470, 477, 514

Proofreader's illusion, 453

Protozoa, 39-40, 188, 302

Psychiatry, 16

Psychoanalysis, 505-508, 521, 533, 567-669

Psychology,
definition of, 1-2, 5-8, 17-18;
methods of, 9-16;
varieties, 2-6

Psychopathology, 16, 498, 540-541, 545-550, 567, 569

Punishment, 304-305

Purpose, 69-71, 75, 78, 524-527, 542

Puzzle experiment, 308-310, 315-319, 463-464

Pyle, 343

Pyramid cells, 51, 52, 61

Pyramidal tract, 52-55, 57, 62

Random activity, 151-152

Rationalization, 470-471, 531

Raynor, 331

Reaction, 22-26, 39-41, 45-49, 65-66, 68, 75, 84, 256, 262-263, 266,
423, 428;
acquired, 89-90, 94, 99-102;
delayed, 76-77, 429;
native, 89-102;
preparatory, 77-84, 111-112, 125-128, 132;
time, 22-24, 75, 424

Reading, 250-251, 258, 262, 267-268, 384, 427, 453, 512-513

Reaney, 522

Reasoning, 320, 422, 462-479, 520;
in animals, 310, 317-318, 463-464

Recall, 354-356, 366-385, 413, 422, 469-471, 500, 519, 563

Recency, 345, 356, 379, 390, 433, 511, 563

Recitation in memorizing, 339-341

Recognition, 187, 357-360

Red-green blindness, 210

Reflex, 24-26, 53, 107-109, 256, 297;
conditioned, 303-304;
control of, 54-55;
arc, 26-30, 34, 36-37;
centers, 30, 53

Relationships, response to, 286-287, 317, 320, 333-336, 345, 404-405,
432, 467-468, 520

Relief, 79, 84

Reproduction, instinct of, 116

Respiration, 37, 55, 141, 176, 527

Response by analogy, 405-406, 435, 452-455

Restlessness, 78-79, 112

Retention, 286, 302, 349-353, 360, 562

Retina, 191, 193, 195, 210-211, 233, 441-442

Revery, 376-380

Ribot, 571

Rivalry, 165-166, 474, 489, 543;
binocular, 253-254

Robinson, 522

Rods, 191, 226

Rotation, sense of, 236-238

Rosanoff, 20