The case I have now to describe is that of a woman whose characteristics during childhood were thoroughly boyish, and who at this time experienced homosexual inclinations; during the period of the puberal development, however, the homosexual tendencies disappeared, never to return. CASE 10.--Mrs. X., twenty-six years of age, happily married for five years past, enjoys excellent health, with the exception of pains during menstruation, has normal intercourse with her husband, experiencing sexual impulse of full intensity, and a normal voluptuous sensation. The family history is healthy on the whole; some of the mother's relatives are described as "nervous"; but in so large a family, otherwise healthy, this is of trifling significance. Most of her blood-relations are, so far as inheritable morbid conditions are concerned, thoroughly healthy. As a girl, X. (whose statements, in so far as I was able to inquire, were in all important respects substantiated by her mother) was at first accustomed to seek the companionship of boys only. She was continually playing with her brothers and their friends, and was always the leader in their wildest games including war-games, and playing at Indians. During childhood she was almost always regarded as "the baby," although she had a sister two years younger than herself, this sister being altogether girlish in her ways. Very seldom did X. play with anyone but the boys; when she did on rare occasions seek other companionship, it was always that of the sister of one of her boy friends. The two girls had obviously great sympathy each for the other, manifested when they were as yet only nine years of age, and increasing as the years went on. The closer her association became with this girl, the more did X. withdraw from the companionship of the boys, to devote herself to her girl friend. The association became more and more intimate; and when they were both thirteen years old their endearments passed from kisses and embraces to manipulation of the genital organs. In these latter, X. always played a passive part, not herself touching her own genital organs nor those of her friend. Occasionally X. would feel drawn towards some other girl, but such errant inclinations never lasted long. At about the time when her fondness for the other girl began, that is to say, during her tenth year, X., who was then accustomed to compassionate herself for not having been born a boy, began to assume a more definitely boyish behaviour. Under the pretence of "dressing up," she used to wear her brother's clothes; occasionally she smoked, although in her home, and in the circle to which her family belonged, smoking was disapproved of even in grown women. At the age of fourteen, X. began to menstruate. The friendship between the two girls continued until the seventeenth year of life. Then X. gradually "came out," her homosexual tendencies disappeared, and at the same time her feminine nature became apparent.