Mr. L., 45 years of age, happily married, and father of several children, was always healthy and strong and had never had gonorrhoea or syphilis, but had freely masturbated when he was young. He always considered himself a powerful man. He is given to athletics, horseback riding, ball playing, swimming, rowing, etc. For the last year the patient noticed a certain weakness in his potency. As soon as he enters the vagina, ejaculation takes place at once and is followed by immediate flaccidity of the penis. Sometimes, while trying intromission, the erection ceases like a shot ante portas. When he does not try congressus the erection lasts much longer. The patient’s wife has been of a rather frigid nature, never asking or caring for concarnatio. But recently she seems at times to have rather a certain longing for the embrace. This fact makes the patient feel doubly miserable, not to succeed, when the partner seems to desire and enjoy the initus. This case is one of those where objectively there is very little to discover. In some cases of atonic impotence the patients show neurasthenic or cerebrasthenic symptoms. The underlying cause of the impotence, as a rule, determines the symptom-complex of the case. If the cause of the impotence is excess in masturbation, the case will show all the symptoms of the typical masturbator. The latter is generally small, emaciated, hollow-chested, thin-necked and weak-kneed. He shows deep-set eyes and pale hollow cheeks. The penis and testicles are small. The penis is cold and shriveled. The patient has a bad taste in his mouth, and suffers from winds in his stomach. He also suffers from obstinate constipation and colicky pains in the bowels. He complains of palpitation of the heart, shortness of breath and of a burning sensation in his arms. He suffers from loss of memory and from tinnitus aurium. The patient also shows a certain moral abasement, incontrollable restlessness, carelessness in dress and person and shambling in gait. The history of the following case is that of a typical masturbator: Mr. C. is 31 years of age and unmarried. At the time of puberty, when he was 14 years old, he began to practise stuprum manu. Se stuprabat manu three to four times daily. When twenty years of age he began to associate cum meretricibus. But the natural initus did not seem to satisfy him. Post omnem initum manu se stuprabat, in addition, as soon as he reached his residence. Three years ago he contracted gonorrhoea, from which he suffered a whole year. Since a year he noticed a certain weakness in his potency. He is able to effect intromission, but before he can begin the act, ejaculation without the least trace of libido takes place, followed by immediate flaccidity of the penis. He has some erections in the morning but they are not complete as in former times.