The principles of treatment laid down were: 1. Removal of the symptoms of neurasthenia. 2. Suggestive treatment looking to (_a_) avoidance of onanism; (_b_) indifference toward his own sex and the disappearance of thoughts of flagellation, both while awake and asleep; (_c_) libido exclusively toward persons of the opposite sex, the occurrence of erections at sight of beautiful women, complete power with women, and dreams of women exclusively. At the first sitting, by means of Bernheim’s method, the patient passed quickly into a state of deep lethargy. At the second sitting (February 5) a cataleptic condition of the muscles was induced. Sittings almost daily. It was seen that stroking the brow induced deeper hypnosis with catalepsy, which, however, did not go beyond deep lethargy. Suggestion was begun in the third sitting. February 10. The patient says that he has no longer any interest in men, but a growing interest in women. He begins to dream of women. February 13. He feels himself free from masochism during the day, and canes and whipping do not interest him any more. At night he still has “weak” dreams of flagellation concerning men, but without lustful feeling or pollution. A short time ago he had had a dream that was entirely strange, and without erotic coloring, to the effect that he whipped himself. February 19. The patient attempted coitus with a puella pleasing to him. Erection was incomplete, and ejaculation did not occur; so he gave up the attempt. The patient finds that his libido toward women is still very slight. He was not discouraged by his failure, and expected ultimate success; for he felt free from his abnormal tendencies, and like another man. On February 20, unfortunately, the patient had to discontinue treatment, being called home by duties there. The fact that traces of sadism (_v. infra_), were simultaneously present, lends certainty to the diagnosis of this rudimentary case as one of masochism. The purely psychical character of this latter perversion is unquestionable. At the same time, the case is combined with incompletely developed contrary sexual instinct, an association not infrequent in masochists and sadists. In contrast with this case of rudimentary masochism, in which there is some difficulty of diagnosis, follows a typical case of masochism, in which the whole circle of ideas peculiar to this perversion appears completely developed. This case, in which there is a detailed personal description of the whole psychical state, is different from Case 44 only in that here there is no thought of a realization of the perverse fancies; and that, notwithstanding the perversion of the vita sexualis, normal stimuli are so far effectual that sexual intercourse is possible under normal conditions.