This book lists and describes the recently enacted laws in Germany for the prevention of hereditary diseases. An introductory chapter deals with the family distribution of several supposedly inherited defects. The eight conditions for which sterilization is now mandatory—inborn feeblemindedness, schizophrenia, circular insanity, hereditary epilepsy, Huntington's chorea, hereditary blindness, hereditary deafness, and hereditary bodily deformities—and the further condition of "severe alcoholism" are discussed in detail. It is interesting to note that severe alcoholism is not considered hereditary but that incurable alcohol craving is believed to rest on a constitutional hereditary psychopathic basis and hence children of these individuals are not to be desired. A chapter on the technic of male sterilization by Lexer of Munich and one on the technic for females by Döderlein are added. Whatever one may think of the basis for these enactments in Germany, this book is and will remain an interesting document.