This book is an important reference source for the origins and subsequent development of the principal concepts that define the discipline of psychology. It provides a quick read for those with specific needs in intellectual history, yet provides sufficient references for the scholar who wants to delve more deeply into the subject. Perhaps more important, it helps the reader to understand the roots of contemporary psychology and the dynamic nature of psychology's concepts. It is a welcome addition to my research library even though it means I now have to redesign my students. "The Journal...