Two cousins, boy and girl, were playmates from the time they were both about three years old. They played at being man and wife; and when they were not actually together, the boy's imagination was occupied with the subject. He thought continually about it, and when he was in bed at night erection occurred, accompanied by an agreeable sensation. He went to sleep, and dreamed that other persons got into bed with him and touched him. Among these persons was the little girl, his cousin. Such dreams recurred very frequently; the girl, moreover, was constantly in his waking thoughts. As he grew older, his fondness persisted; but when at the age of seventeen he made up his mind to tell his cousin of his love for her, she became engaged to someone else. Consequently he suffered from severe nervous shock. In the third place, the two processes, contrectation and detumescence, may occur simultaneously, without the detumescence being associated with the object of the contrectation impulse. Thus cases occur in which boys experience organic sensations in the genital organs leading them to masturbate, and at the same time love someone; and yet when in the company of, and even when embracing the beloved, such a boy will not experience any specific sensations in the genital organs, nor will any impulse arise towards sexual contact with the beloved person. When the two processes are associated in such a manner that proximity to the object of the contrectation impulse arouses the phenomena of detumescence, sexual acts between the two persons are very likely to result--provided, of course, that the affection is reciprocal. In this way many of the sexual acts effected between children originate; and the same is true of those in which children at times very readily lend themselves to the gratification of the sexual passion of adults. We learn from experience that in such cases attempts at actual intercourse may be made by children, usually accompanied by erection, but in most cases without ejaculation. I append a brief report of one case which came under my own observation.