The Biological Basis of Human Freedom.

This book interprets some of the philosophical implications of modern biology in simple, non-technical terms. The author shows that human evolution is unique in the living world. He explains that man is the only biological species with a highly developed capacity for symbolic thought and the use of language, and with a complex body of tradition known as culture. He describes how culture, the exclusive property of man, is transmitted from generation to generation by means of instruction, precept, imitation, and learning, rather than by genes in the sex cells as in biological heredity.