| FIGURE | | PAGE |
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| 1. | Distribution of ability to discriminate among intervals of time, the subjects being adults. (From Seashore’s The Psychology of Musical Talent. Reproduced by courtesy of Silver, Burdett and Company, and of the Columbia Graphophone Company.) | [8] |
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| 2. | Flight of birds, illustrating distribution in ability to fly. (Schematic.) | [9] |
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| 3. | The psychograph of a schoolboy, showing his standing in various mental functions; illustrating use of the horizontal line to denote typical performance. (From Hollingworth’s Judging Human Character. Reproduced by courtesy of D. Appleton and Company.) | [39] |
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| 4. | The psychographs of three schoolgirls, showing their standings in various mental functions, measured to determine mathematical ability; illustrating use of the vertical line to denote typical performance. (From Tests of Mathematical Ability and Their Prognostic Value. Reproduced by courtesy of Agnes L. Rogers.) | [40] |
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| 5. | The psychograph of a schoolboy, showing his standing in various mental functions; illustrating use of the circle as a diagram, the median circumference denoting the typical performance of his age | [41] |
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| 6. | Showing how X improved as measured by Trabue’s “Language Scale A,” from Feb., 1918, to Dec., 1921 | [77]–81 |
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| 7. | Showing X’s improvement in silent reading, from April 15, 1921, to Dec. 2, 1921, as measured by Thorndike-McCall “Reading Scale,” Form I | [82]–83 |
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| 8. | Showing X’s ability to get meaning from printed words, in May, 1922, as tested by Haggerty’s “Sigma 1,” for grades 1 to 3 | [84] |
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| 9. | Showing an account written by X of his week’s reading | [86] |
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| 10. | Composition written at school by X in December, 1920, showing deficiencies in spelling | [107] |
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| 11. | Letter written by X showing how he could spell by use of dictionary | [108] |
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| 12. | Showing efforts to spell of a 14-year-old schoolboy, of IQ 93, after eight years of school instruction. Illustrating extreme dissociation of spelling ability from general intelligence | [110] |
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| 13. | Showing spelling of a 12-year-old girl, of IQ 59, after six years of instruction. Illustrating extreme dissociation of spelling ability from general intelligence | [111] |
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| 14. | Showing spelling of a child 9 years 10 months old, with IQ 143, after three years of instruction. Illustrating dissociation of spelling ability from general intelligence | [112] |
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| 15. | Showing D’s calculations on Test 2, Army Alpha, Form 5, at the age of 10 years 11 months, five minutes being allowed for the performance | [132] |
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| 16. | Showing D’s calculations on Test 6, Army Alpha, Form 5, at the age of 10 years 11 months, three minutes being allowed for the performance | [133] |
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| 17. | Showing R’s calculations on Test 2, Army Alpha, Form 5, at the age of 7 years 6 months, five minutes being allowed for the performance | [135] |
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| 18. | Showing R’s calculations on Test 6, Army Alpha, Form 5, at the age of 7 years 6 months, three minutes being allowed for the performance | [136] |
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| 19. | Showing the psychograph of a stupid child, who has a special ability in representative drawing. (From Manuel’s A Study of Talent in Drawing. Reproduced by courtesy of The Public School Publishing Company.) | [155] |
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| 20. | Showing special ability in drawing of a 14-year-old boy, of IQ near 70 | [156] |
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| 21. | Showing special ability in drawing of a 14-year-old boy, of IQ near 70 | [157] |
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| 22. | Showing the special ability to cut silhouettes, of a feeble-minded man, inmate of an institution for mental defectives | [159] |
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| 23. | Charlie Chaplin pursuing a gentleman, and pursued by a policeman. Showing the special ability to draw, of a feeble-minded man, in an institution for mental defectives | [160] |
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| 24. | Showing attempts by two distinguished university professors to cut silhouettes of an elephant | [161] |
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| 25. | Psychograph of G, showing special ability in music and drawing combined with mediocre intelligence | [177] |
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| 26. | Psychograph of M, showing special defect in music combined with very superior general intelligence | [179] |
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| 27. | Showing mirror writing by public school pupils. (From Beeley’s An Experimental Study of Left-Handedness. Reproduced by courtesy of the University of Chicago Press.) | [189] |