This best seller is a comprehensive yet readable treatment of psychology in all its dimensions. Beginning with the philosophical endeavors of the early Greeks, this text traces those early themes into the development of the philosophies of empiricism, materialism, rationalism, romanticism, and existentialism. Hergenhahn shows how these themes combine with developments in natural science and experimental physiology to form the major schools of psychology. This account presents in a simplified, direct fashion that makes these complex issues comprehensible to undergraduate students.