This book is the eighteenth volume of a series issued under the general title of "Medical Practice, a Collection of Special Subjects for the Improvement of Physicians." The idea is a good one, because each volume is written by a specialist well known in his particular line of work.
The pathology of heredity, or rather the pathologic conditions of the human body that can be transmitted by heredity, is perhaps no new problem even for those of the medical profession not versed in the complexities of mendelian transmission, but it is difficult for any one except the eugenist to really understand them. However, every one who has had even limited clinical experience cannot fail to be impressed by the occurrence of undesirable physical and psychic departures from the normal, that are frequently impossible to handle satisfactorily, among patients who apply for diagnosis and treatment. The menace to racial health of