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ILLUSTRATIONS.

12.

1-11. Illustrations of distributions of traits in individuals. 1. Memory span of B. F. A. 1A. Memory span of B. F. A. 2. Accuracy of discrimination of length of E. H. 2A. Accuracy of discrimination of length of E. H. 3. The condition of labor in the case of the Amalgamated Society of

Engineers. ЗА. . The condition of labor in the case of the Amalgamated Society of

Engineers. 4. Reaction-time of H. 5. Quickness of Movement of T. 6. Ability in addition of J. S. 7. Efficiency of perception of S. 8. Condition of a trade. 9. Attendance of a school. 10. Receipts of a sub-treasury. 11. Pulse of B.

Typical form of distribution. 13. Discrimination of length in 11 individuals. 14. Types of asymmetrical distribution. 15. Two distributions differing only in variability. 16. A form of distribution to illustrate the possibility of simple mathe

matical expression of a variable quantity. 17. A form of distribution to illustrate the possibility of simple mathe

matical expression of a variable quantity. 18, 19, & 20. Comparison of distributions based on few and on many rec

ords from each member of a group.

Distribution of height of adult men. 22. Distribution of weight of adult men. 23. Distribution of cephalic index of Alt-Bayerische skulls. 24. Distribution of length of male infants. 25. Distribution of girth of chest of adult men. 26. Distribution of strength of arm pull. 27. Distribution of body temperature at the mouth.

Distribution of heart rate. 29.

Distribution of reaction time of college freshmen. 30. Distribution of memory span for digits. 31. Distribution of perceptive ability of 12-year-old boys. 32. Distribution of ability in controlled association. 33. Distribution of accuracy of discrimination of length.

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28.

34. Distribution of perceptive ability. 35. Distribution of ratio of attendance to enrollment in city schools. 36. Distribution of wage of cotton operatives. 37. Distribution of age of graduation from American colleges. 38. Distribution of cost per pupil of education. 39, 40. Distribution of wages of American workingmen. 41. Distribution of ratio of attendance to enrollment in city schools. 42. Distribution of income of American colleges. 43. Distribution of age at marriage of gifted men. 44. Distribution of period between marriage and divorce. 45. Distribution of size of New England families. 46. Distribution of infant mortality. 47. Distribution of age at death. 48. An irregular distribution. (Hypothetical.) 49. A regular distribution. (Hypothetical.) 50. The influence of combination of species upon the form of distribution

of a group 51, 52, 53 and 54.

The influence of selection upon the form of distribution of a group. 55-67. The influence upon the form of distribution of the number and

nature of causes producing the quantity. 68. Form of distribution assumed as an illustrative case of the possibility

of transmuting any ordered series of known form of distribution. 69. Fig. 68 approximated by a series of rectangles. 70. Fig. 68 with base line divided to correspond to Table XXIX. 71-76. biļustrations of the inadequacy of a comparison of groups by their

averages alone. 77. Comparison of boys and girls with respect to the A test. 78. Change in average height of 25 boys during 5 years. 79. Change in each of 25 boys in height during 5 years. 80. Change in each of 25 boys in height from 12 to 14 and from 14 to 16. 81. The relation between the refraction of air and its density. 82. The relation between lapse of time and memory. 83. The relation between two perceptive abilities. 84. The same facts as in Fig. 83, but referred to central axes. 85. The facts of Figs. 83 and 84 with the individual measures of each

array replaced by their central tendency. 86. Comparison of two groups. 87. Forms of distribution.

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