_The pathology of female impotence._—The same four kinds of impotencies found in men are also met with in women, with the only difference that the frequency of one or the other of the impotencies is different in the different sexes. They are: 1) impotence of voluptas, 2) impotence of copulation, 3) impotence of reproduction, and 4) impotence of libido. _Impotence of voluptas._—The entire absence of the sense of sex, or impotence of voluptas, where the individual has absolutely no sexual inclination to any individual of the other sex, is more frequently met with in women than in men. Still even in women this idiopathic frigidity, this insensibility where the woman is completely frigid by temperament, is much rarer than is generally believed. In fact, it is extremely difficult to find a woman who is without aptitude of sexual emotion. Physiological frigidity exists in infants and in very old age. After a regular and satisfactory orgasm the woman is physiologically more or less anaesthetic for some time. The ablation of both ovaries before puberty causes total anaesthesia, while the operation after puberty produces, for a certain time, at least, only an impairment of libido, or orgasmus retardatus. Congenital degeneration of the ovarian glands will be accompanied by total absence of the sense of sex. As in men, the total absence of sexual desire is found in severe cases of neurasthenia, where the entire nervous system is in a low state of efficiency. Idiopathic impotence of voluptas is further found in low idiots and in dementia, where there is lack of understanding of the opposite sex. The sexual perversity of homosexuality, as a rule, causes total impotence of sexual desire for the opposite sex. Sometimes the cause for the anaesthesia lies in the centre, otherwise the patient is perfectly normal, as in the following case: The patient, forty years of age, twenty years married, is a highly cultured lady. She never had a child or was pregnant while living with her two first husbands. A prominent gynaecologist, who had examined her several years previously, attributed the cause of her sterility to an infantile uterus. She has never, in her life, experienced any sexual desire and seems to be proud of it. She attributes this lack of passion to her great mental activity. An examination revealed a pregnancy of about four months.