As a result of these experiences, I feel justified in coming to the following conclusions regarding masturbation during childhood. _It has not been proved that masturbation during childhood, with or without ejaculation, is generally dangerous. The possibility of danger resulting from the practice is, however, increased by long-continued and frequently repeated masturbation; also by the artificial postponement of the voluptuous acme, and by congenital predisposition to nervous disorders._ My notes of the cases which I have seen during many years of medical practice show that, even in children, masturbation does not necessarily do any harm. CASE 15.--The girl X., four years of age, was brought to see me because it had been noticed that she frequently tried to handle her genital organs, and also that she stimulated the same organs by means of rubbing movements of the crossed thighs. Her mother had further from time to time noticed rocking movements, associated with a fixed stare, which had aroused suspicions of the occurrence of the sexual orgasm. Various methods were tried to put a stop to these practices, but without result. Hypnotic treatment was not tried, because the child was still too young and her attention wandered too much. Mechanical methods of control were also fruitless. The trouble continued for five years, during all of which time the child was under my own observation. She went to school, where she proved a diligent scholar, and was one of the most successful pupils; her physical condition was also excellent. Thenceforward, for several years, I received no precise information about the patient, although from time to time I saw some of her associates. But after about eight years, I had an opportunity of learning her later history. The child which had begun to masturbate when four years old was now a young lady of eighteen. When fourteen years old she had for some months suffered from chlorosis, but had never been troubled by any other serious illness. I could not learn with certainty whether the habit of masturbation had been discontinued; but there had been no definite evidence of the practice of masturbation, or of any other artificial sexual stimulation, after the age of nine. At the present time X. is perfectly healthy.