One of the conditions most difficult to diagnose clinically with any degree of certainty is hemorrhage of the ovary. In most instances the true source of the bleeding is recognized only during operation. The condition is usually seen in young women about the time of the menstrual period, and the bleeding often appears simply as an exaggeration of that which takes place when the ovum is normally discharged from its follicle. Two types of ovarian hemorrhage may be distinguished: In one, the bleeding is primary; in the other, it follows rupture of a hematoma. The etiology of the primary form is given by Wilson1as follows: As the menstrual period approaches, there is an increased flow of blood to the pelvic organs. This results in intra-ovarian tension and forces the maturing follicle toward the point of least resistance, the periphery of the gland. At a bloodless and thinned-out portion