Performance, as criterion of ability, 5. Performance tests, Pintner’s, 85. Peter, R., 163. Peters, W., 140. Phonics, taught to non-readers, 66; carried to excess, 67. Pictorial completion test, Healy’s, 85. Pittman, M. S., 113. Plato, 1. Platt, W., 182. Pöhler, Otto, 91. Poull, L. E., 93, 97. Problem-solving, 119 Prodigies, 122 f. Pryor, H. C., 113. Psychographs, to picture individuality, 38 ff.; of individuals, 39, 40, 41, 155, 177, 179. Psychological analysis, of reading, 58; of spelling, 98; of calculation, 116; of talent in drawing, 143; of musical talent, 165; of leadership, 192. Quantitative investigation, results of, 4 f.; methods of, 11 f. Ranschburg, P., 58, 97, 140. Reading, relation to IQ, 57; very early, 58; mental age necessary for, 61 f.; oral, 60; special defect in, 65 ff.; special ability in, 91 f.; effect on spelling, 106. Révész, G., 47, 166, 171, 182. Richet, C., 182. Riley, H. A., 52, 56. Rogers, A. L., 40, 115, 140. Rugg, H. O., 47, 211. Rupp, H., 166, 182. Scarborough school, experimentation in, 106 f. Schmitt, C., 65, 90, 97, 119, 140. Schröck, G., 63, 96. Schussler, H., 166, 168, 169, 182. Scripture, E. W., 123, 140. Seashore, C., 7, 10, 166, 167, 171, 182. Senile dements, 20 f., 26. Simon, Th., 21, 24, 46. Simpson, B. R., 18, 47, 147. Smith, J. H., 119, 140. Spaulding, F. E., 211. Spearman, C., 5, 11, 15, 16, 22, 23, 24, 29, 30, 34, 47, 54. Special abilities, measurement of, 37 ff.; detection of, 37 ff.; origin of, 43, 45; frequency of, 44; relation to school progress, 201 f. Special defects, and brain anatomy, 52; detection of, 37 ff.; origin of, 43, 45; frequency of, 44; relation to school progress, 201 f. Special senses, in reading, 59. Speech defects, 70. Spellers, psychological examination of, 100 f. Spelling, correlation with IQ, 100; special defect in, 98 ff.; analysis of, 98 ff. Stanford-Binet, 57, 58, 68, 85, 95, 109, 150, 191, 193. Stanton, H. M., 175, 182. Stenquist, J. L., 190, 195. Stern, W., 10, 11. Tachistoscope, 58. Taussig, F. W., 195. Terman, L. M., 47, 92, 97, 131, 193, 201, 211. Terry, P. W., 140. Thompson, J. R., 47. Thomson, G., 29, 30, 47, 54. Thorndike, E. L., 10, 11, 15, 16, 33, 34, 47, 62, 97, 116, 117, 140, 146, 163, 190, 195, 211. Thorndike-McCall scale, 57, 82, 83. Tildesley, M. L., 163. Tilney, F., 52, 56. Tone deafness, 172. Tonoscope, 174. Trabue, M. R., 190. Trabue’s scale, 57, 77 ff. Transfer of training, 28, 104. Truant officers, 199. Types, folk notions concerning, 2; human beings not divided into, 6. Uhl, W. L., 97, 119, 121, 140. Unmusical children, 169. Washburn, C., 211. Weglein, D. E., 17, 48. Weseen, M. H., 113. White, A., 93, 97. Whitford, W. G., 163. Winford, C. A., 105. Winnetka schools, organization of, 205, 207. Witmer, L., 113, 170.