The term, spermatorrhœa, has been too loosely applied to a class of cases which the author has chosen to describe under _pseudo-spermatorrhœa_, and also to a class of cases more properly called sexual neurasthenia; when the weakness of a nervous character is only noticeable in a minor degree, or in contradistinction to centric structural changes. But the term is useful to describe such losses as are involuntary, and of frequent occurrence; or, as it were, such as occur without intentional friction of the glans, or without undue nervous shock from accident or fear of injury. To such emissions should the term be confined. Healthy young men sometimes have emissions before or soon after the intromission of the penis, and such occurrences are not uncommon; but with the individual such an occurrence rarely happens: such should not be called spermatorrhœa――only a sexual weakness――neurasthenia. Again, after prolonged sexual excitement, when the organs are simply weak and the erotic energy intense, an emission is not sufficient to declare such a diagnosis. When it is customary for a male to ejaculate immediately after intromission of the organ, he may have, and quite likely has, a spermatorrhœa; but this is not in itself diagnostic of anything further than mere weakness; and he must at other times than these lose semen, to constitute that real flow which is the true signification of the term. When a male commonly ejaculates before venereal friction of the glans has taken place, and in successive attempts at sexual congress has been baffled, he most certainly has spermatorrhœa, as well as partial impotence. Whenever an involuntary emission is followed by weakness, headache, wakefulness, heat of the skin, there is certainly great sexual neurasthenia; and, if such losses are continuous, the diagnosis of spermatorrhœa is without a doubt. It is necessary that these points should be duly understood, in order that our future study of the disease may not lead to confusion in the study of the conditions of the nervous system leading to such phenomena.