. James H. Breasted, The Dawn of Conscience (New York: Charles Scribner's Sons, 1933). Sentences from pp. x. 24, 12, 18, 121, 411.

. O. Riddle (ed.), The Teaching of Biology in Secondaty Schools of the United States (Lancaster, Pa.: Science Press, 1942).

. James B. Conant, Modern Science and Modern Man (New York: Columbia University Press, I952), pp. 98–99.

. New Hyde Park, N.Y.: University Books, 1954.