In 1953 Dr. Harris published a previous book entitled An Introduction to Human Biochemical Genetics. This book was a part of The Galton Laboratory Memoir Series, was paperbound and numbered 96 pages. The present volume represents a thoroughly revised and updated version of the first. It has hard covers, 310 pages, and a striking, handsome dust jacket. In 1953 human genetics, still a little off-beat, was just beginning to attract the attention of physicians.