Yoder: "Solitude seems to have played a rather striking role in the lives of these great men. Either by nature or by opportunity, they have stayed a great deal alone."

Nevertheless, many of the fifty persons studied by Yoder enjoyed physical activity. Washington loved outdoor sports, Schiller was a leader in athletics, Byron was an enthusiastic swimmer and rider, and Lincoln was the champion wrestler and woodcutter of his neighborhood.

8. The popular idea that great men owe their success to their mothers' influence upon their education does not receive verification from a study of these cases. The mother's place seems very often to have been filled by some other person, frequently an aunt, either because the mother had died, or because there were many other children to care for. "The role of the aunt stands out prominently."

9. These great persons were, in the decided majority of cases, derived from well-to-do families. Most of them were privately educated, by tutors or in private schools. Very few were "self made."

TERMAN'S INFERENCES FROM BIOGRAPHY

Terman (20) has effected an interesting advance over Yoder's method, in the interpretation of evidence from the biography of adults. [2] By analyzing data in the biography of Francis Galton, and by relating these data to modern knowledge of mental tests, Terman derives that the IQ of Francis Galton in childhood must have been not far from 200.

As Terman has elsewhere pointed out, these attempts to study genius in childhood by inference from the biography of adults are very unsatisfactory. In the first place, only those whose potentialities have been realized are included in such study. Since factors other than innate intellectual power act also as determinants of eminence, we cannot be sure whether equal capacity for selective thinking may have existed in persons who died before the age of achievement, who were younger sons, who were girls, or who were the children of the poor. Moreover, such evidence as can be gleaned concerning those who have achieved eminence is comparatively unsystematic and unreliable as regards childhood.

Most clearly related to our present study are the previously reported observations of children made directly, during childhood, by trained investigators. The modern development of mental tests has now enabled psychologists to identify young children who deviate from average in the direction of superiority as regards selective thinking, and to follow their development for some years. Eventually, therefore, it will be known how to recognize those children who can become "great," and whether extreme deviation in mental tests is a basis of prophecy.

BIBLIOGRAPHY

1. BINET, A. _Psychologie des grandes calculateurs et joieurs d'échecs. Hachette, Paris; 1894.

2. BRIMHALL, D. "Family Resemblances among American Men of Science," American Naturalist, Vol. 56 (1922) and Vol. 57 (1923).

3. CASTLE, C. S. "Statistical Study of Eminent Women." Archives of Psychology, Vol. IV, No. 27 (1913).

4. CATTELL, J. McK. "A Statistical Study of Eminent Men." Popular Science Monthly (1903).

5. ——— "Families of American Men of Science." Popular Science Monthly, Vol. 86, pages 504-515 (1915).

6. CLARK, E. L. American Men of Letters: Their Nature and Nurture. Columbia University Press, New York; 1916.

7. COX, C. M. The Early Mental Traits of Three Hundred Geniuses. Genetic Studies of Genius: Vol. 2. Stanford University Press, Stanford University, California; 1926.

8. DAVIES, G. R. "A Statistical Study of the Influence of the Environment." Quarterly Journal of the University of North Dakota (1914).

9. DE CANDOLLE, A. Histoire des Sciences et des Savants depuis Deux Siècles. Geneva, Switzerland; 1873.

10. ELLIS, HAVELOCK. A Study of British Genius. Hirst and Blackett, London; 1904.

11. GALTON, FRANCIS. English Men of Science. The Macmillan Company, London; 1874.

12. ——— Hereditary Genius. The Macmillan Company, New York, 1914. (Original edition, London; 1869.)

13. LEHMAN, HARVEY C. "The Creative Years in Science and Literature." Scientific Monthly, Vol. XLIII, pages 151-162 (1936).

14. LOMBROSO, C. The Man of Genius. Scott, London; 1895.

15. MIDDLETON, W. C. "The Propensity of Genius to Solitude." Journal of Abnormal and Social Psychology, Vol. 30, pages 325-332 (1935).

16. MITCHELL, F. D. "Mathematical Prodigies." American Journal of Psychology, Vol. 18, pages 61-143 (1907).

17. ODIN, A. Genèse des Grands Hommes des Lettres Français Modernes. Paris et Lausanne; 1895.

18. RASKIN, E. "Comparison of Scientific and Literary Ability: A Biographical Study of Eminent Scientists and Men of Letters of the Nineteenth Century." Journal of Abnormal and Social Psychology, Vol. 31, pages 20-35 (1935).

19. SCHUSTER, E. "The Promise of Youth and the Performance of Manhood." Eugenics Laboratory Memoirs, Vol. 3, pages 16 ff. London; 1907.

20. TERMAN, LEWIS M. "The IQ of Francis Galton in Childhood." American Journal of Psychology, Vol. 28, pages 209-215 (1917).

21. VISHER, S. S. "A Study of the Type of Place of Birth and of the Occupation of Father of Subjects of Sketches in Who's Who in America." American Journal of Sociology, 1925.

22. ——— "The Comparative Rank of the American States." American Journal of Sociology, Vol. 36, pages 735-757 (March, 1931).

23. WHITE, R. K. "Note on the Psycho-pathology of Genius." Journal of Social Psychology, Vol. 1, pages 311-315 (1930).

24. ——— "The Versatility of Genius." Journal of Social Psychology, Vol. 2, pages 460-489 (1931).

25. YODER, G. E. "A Study of the Boyhood of Great Men." Pedagogical Seminary, Vol. 3, pages 134-156 (1894).

[1] EDITORIAL NOTE. No revision of this chapter has been found among the author's papers. In the earlier manuscript reporting but five cases, there was a brief section entitled "Inferences from the Study of Adults," and in the incompletely revised manuscript a list of references is given for this chapter which had not yet been written. The earlier sections and the revised bibliography are, therefore, all that is available for this chapter. The bibliography will be sufficient to guide any reader who may be further interested in the details of the scientific study of adults.

[2] EDITORIAL NOTE. Had these pages been written at a later date, or revised by the author, of course the more recent work of C. M. Cox (7), inspired by Terman, would have been considered.