The problem is too delicate, too complicated, also too natural and simple, to be solved by hereditary disease and self-abuse. When we shift the ground of argument from acquired to inborn sexual inversion, its puzzling character will become still more apparent. We shall hardly be able to resist the conclusion that theories of disease are incompetent to explain the phenomenon in modern Europe. Medical writers abandon the phenomenon in savage races, in classical antiquity, and in the sotadic zone. They strive to isolate it as an abnormal and specifically morbid exception in our civilisation. But facts tend to show that it is a recurring impulse of humanity, natural to some people, adopted by others, and in the majority of cases compatible with an otherwise normal and healthy temperament. Krafft-Ebing calls attention to the phenomenon of permanent _effeminatio_, in males unsexed by constant riding and the exhaustion of their virility by friction of the genitals--a phenomenon observed by Herodotus among Scythians, and prevalent among some nomadic races of the Caucasus at the present day.[27] He claims this in support of his theory of masturbation; and within due limits, he has the right to do so. The destruction of the male apparatus for reproduction, whether it be by castration after puberty, or by an accident to the parts, or by a lesion of the spine, or by excessive equitation, as appears proved from the history of nomad tribes, causes men to approximate physically to the female type, and to affect feminine occupations and habits. In proportion as the masculine functions are interfered with, masculine characteristics tend to disappear; and it is curious to notice that the same result is reached upon so many divers ways. Next he discusses a few cases in which it seems that sexual inversion displays itself episodically under the conditions of a psychopathical disturbance.[28] That is to say, three persons, two women and one man, have been observed by him, under conditions approaching mental alienation, to exchange their normal sexual inclination for abnormal appetite. In the analysis of the problem these cases cannot be regarded as wholly insignificant. The details show that the subjects were clearly morbid. Therefore they have their value for the building up of a theory of sexual inversion upon the basis of inherited and active disease. (B) Ultimately, Krafft-Ebing attacks the problem of what he calls "the innate morbid phenomenon" of sexual inversion.[29] While giving a general description of the subjects of this class, he remarks that the males display a pronounced sexual antipathy for women, and a strongly accentuated sympathy for men. Their reproductive organs are perfectly differentiated on the masculine type; but they desire men instinctively, and are inclined to express their bias by assuming characters of femininity. Women infected by a like inversion, exhibit corresponding anomalies.