HISTORY XXXIII.--M.O., 30 years of age, born in the United States, of English father and of mother whose father was Scotch,--the rest of his ancestry being English of long standing in America, with a very little admixture of Dutch blood. He is 5 feet 8 inches in height, and has brown hair and eyes. No hereditary troubles so far as known. In childhood, for some time "threatened with chorea." Is subject to tonsillitis and a stubborn though not severe form of indigestion, induced by sedentary habits. He is of quick, nervous temperament. Has an aversion from most outdoor sports, but a great esthetic attraction to nature. Highly educated. As far back as he can remember, he lived in a house from which his parents removed when he was 4 years old. Before this removal, he remembers two distinctly sexual experiences. A cousin five years older was in the bathroom, seated, and M.O. was feeling his sexual organs; his mother called him out. On another occasion he was in a wagonhouse with a girl of his own age. They were lying on a carriage-seat attempting intercourse. The girl's older sister came in and found them. She said: "I am going to tell mamma; you know she said for you not to do that any more." With each of these clear memories comes the strong impression that it was but one among many. Five years ago M.O. met a man of his own age who had lived in that neighborhood at the same time. Comparing notes, they found that nearly all the small children in it had been given to such practices. The neighborhood was a thoroughly "respectable" middle-class one. From it, M.O. removed to another of just about the same character, and lived there until he was 11 years old. Of this period his memories are very fresh and abundant. With a single exception, all the children between 5 and 14 years of age appear to have indulged freely in promiscuous sexual play. In little companies of from four to twelve they went where trees or long grass hid them from observation, and exhibited their persons to one another; sometimes, also, they handled one another, but not in the way of masturbation. Of this last, M.O. was wholly ignorant. Sometimes when but two or three were together, intercourse was attempted. In M.O.'s case there was eager sexual curiosity, and a more or less keen desire, but actual contact brought no great satisfaction. On two or three occasions girls practised _fellatio_, and he then reciprocated with _cunnilinctus_, but without pleasure. In all these plays he is sure that girls took the initiative as often as boys did.