the American Social Hygiene Association; Mrs. Roger S. Forbes, President, and Mr. Ralph P. Bridgman, Director, of the Parents' Council of Philadelphia; Dr. Benjamin C. Gruenberg, Managing Director of the American Association for Medical Progress; Miss Betsey Libbey, Miss Frederica Schwartz, and others of my associates in the Family Society of Philadelphia; Mr. Walter H. Magill, Assistant Professor in the School of Education at the University of Pennsylvania; Dr. Clarence E. McClung, Professor of Zoology and Director of the Zoological Laboratory at the University of Pennsylvania; Dr. Frankwood E. Williams, Medical Director of the National Committee for Mental Hygiene; Mr. Alfred F. Whitman, Executive Secretary of the Children's Aid Association of Boston; Dr. Marion E. Kenworthy, Consultant in Psychiatry at the Institute of Child Guidance, New York.
I have also found especially helpful the following books which may prove to be of interest to those who desire to read further in this field—
Wonderbook of Plant Life by J. H. C. Fabre.
Childhood of Animals by P. C. Mitchell.
The Courtship of Animals by W. P. Pycraft.
