[Footnote 1: Interest in Relation to Muscular Exercise. American Physical Education Review, June, 1902, vol. 7, pp. 57-65.]
[Footnote 2: The Influence of Exercise upon Growth by Frederic Burk. American Physical Education Review, December, 1899, vol. 4, pp. 340-349.]
[Footnote 3: A Study of Dolls, by G. Stanley Hall and A.C. Ellis. Pedagogical Seminary, December, 1896, vol. 4, pp. 129-175.]
[Footnote 4: Studies in Imagination, by Lilian H. Chalmers. Pedagogical Seminary, April, 1900, vol. 7, pp. 111-123.]
[Footnote 5: Some Psychical Aspects of Physical Exercise. Popular Science Monthly, October, 1898, vol. 53, pp. 703-805.]
[Footnote 6: Amusements of Worcester School Children. Pedagogical Seminary, September, 1899, vol. 6, pp. 314-371.]
[Footnote 7: A Study in the Play Life of Some South Carolina Children. Pedagogical Seminary, December, 1900, vol. 7, pp. 439-478.]
[Footnote 8: Arbeit und Rythmus. Trubner, Leipzig, 1896.]
[Footnote 9: Descent of Man. D. Appleton and Co., 1872, vol. 1, chap. vi, p. 204 _et seq_]
[Footnote 10: Teasing and Bullying. Pedagogical Seminary, April, 1897, vol. 4, pp. 336-371.]
[Footnote 11: See my Study of Anger. American Journal of Psychology, July, 1899, vol. 10, pp. 516-591.]
[Footnote 12: Der deutsche Student am Ende des 19 Jahrhunderts, 6th ed., Göschen, Leipzig, 1896. See also H. P. Shelden: History and Pedagogy of American Student Societies, New York, 1901, p. 31 _et seq_.]
[Footnote 13: Bushido: The Soul of Japan. An exposition of Japanese thought, by Inazo Nitobé. New York, 1905, pp. 203 _et seq_.]
[Footnote 14: The Hearts of Men. Macmillan, 1901, chap. xxii.]
[Footnote 15: La Puberté. Schleicher Frères, éditeurs, Paris, 1902.]
[Footnote 16: See A.W. Trettien. Creeping and Walking. American Journal of Psychology, October, 1900, vol. 12, pp. 1-57.]
[Footnote 17: Constructive and Preventive Philanthropy, by Joseph Lee. Macmillan, New York, 1902, chaps. x and xi.]
[Footnote 18: C.O. Bernies. Physical Characteristics of the Runner and Jumper. American Physical Education Review, September, 1900, vol. 5, pp. 235-245.]
[Footnote 19: A Study in the Play Life of some South Carolina Children. Pedagogical Seminary, December, 1900, vol. 7, pp. 459-478.]
[Footnote 20: Education by Plays and Games. Pedagogical Seminary, October, 1894, vol. 3, pp. 97-133.]