The tacit acceptance that hemophilia is a rare and mysterious disease that should be managed and treated only by specialists has no doubt been responsible for the tendency of many physicians to assume with reluctance the responsibility of taking care of hemophiliac patients. This attitude is further fostered by the unsatisfactory presentation of this disease, especially in regard to diagnosis and treatment, in the standard textbooks and treatises on medicine. As a consequence, many cases of hemophilia remain undiagnosed; the patients often receive inadequate care and become crippled as the result of hemorrhages which might be prevented or controlled. Hemophilia is not an uncommon disease. I have studied over 20 hemophiliacs who reside in Milwaukee, and I feel certain that there are many more in this community that have not come to my attention. It is probable that the incidence in the white population is not markedly different in various