This circumstance also disclosed an interesting sidelight. She confessed to me that the Frenchwoman was also her brother’s sweetheart. It had never been mentioned by the woman but she knew it even before she entered into intimate relations with her. Nevertheless it was her happiest period. The depression is thus traceable to a second source. The brother had abandoned the Frenchwoman, having chosen another sweetheart, of whom he was very fond and whom he intended to marry. The Frenchwoman was only a sensuous play affair with him, the brother belonged wholly to her. They were always together and she knew all his secrets. She was never jealous when she knew that he kept up relations with some girl or woman so long as he did not love soulfully. But now the brother became acquainted with a wealthy, beautiful girl, with whom he fell in love and whom he was going actually to marry. This, for the brother, lucky event,—came to nothing in the end on account of the opposition of the girl’s family,—left her cool. All she saw was that she was losing her brother, and that he no longer belonged to her. He could not marry the girl because her parents required that he should first prove his ability to support her. But the two lovers agreed to wait for one another and the brother had gone already pretty far and he may yet succeed to marry the girl, despite the mother’s deplorable reputation. He lives no longer with his family and avoids the old home. He only sees her from time to time and they are still good old pals, whenever they meet.... This interesting analysis illustrates all the chief points to be found in the psychogenesis of male homosexuality. In fact the girl was on the point of becoming as fond of men as her mother, perhaps of indulging in bisexual activities. Her sister’s experience opened her eyes and acted as a terrible warning. The yearning for purity which animates every soul and is the polar counterpart of the desire for tasting every sort of experience, became uppermost in her case, the fear of becoming like the sister, or like the mother, and her hatred of the mother, jointly, had the effect of shaping her into a different being. She probably would have not yielded to the homosexual love of the Frenchwoman had she not been overcome by the fact that the woman was her brother’s sweetheart. It was a case of incest through a third person.... She hated her mother and had to protect herself against the danger of having children who grow up to be one’s enemies. Thus children became her enemies. The father played a negligible rôle in her life and had no influence on the development of her homosexuality.