This is one of the few books on genetics devoted entirely to human genetics. It is written for advanced students of biology and medicine and for specialists in the field of genetics. Consequently the emphasis on mathematics may serve as a deterent to the average reader. Much of the material covered, however, can be read with pleasure and profit by the less qualified reader. The final three chapters dealing with the applications of genetic knowledge to man should be of particular interest to the practicing physician. In these the authors discuss the counseling of patients regarding genetic problems, blood-group determinations in cases of disputed parentage, and eugenic sterilization of the unfit. Also of general interest are the discussions on the genetic risks involved in the use of atomic weapons, genetic carriers of inherited disease, and genetically controlled biochemical defects.