This unique textbook deals with the nature, origins, development and causes of human variety. Intended especially for use in physical anthropology courses, it concentrates on the biological dynamics of past and present human populations. For the new edition, the text has been rewritten completely, there are two American co-authors, and the scope as a whole is broader. The book will continue to serve as an outstanding reference for anyone interested in human biology. Previous publication dates March 1977, July 1968