A textbook for third year undergraduates and postgraduates. In a challenging philosophic investigation of the origin of consciousness and human culture, Dewart (religion, emeritus, U. of Toronto) proposes a theory to explain the origin of all specifically human traits. Complementing the theory of evolution through natural selection, it explains the emergence and those the continuing evolution of characterstics through the interaction of experience and speech. Annotation copyrighted by Book News, Inc., Portland, OR.