The general direction of the investigation is easy to understand from what has already been stated. A woman’s demand for emancipation and her qualification for it are in direct proportion to the amount of maleness in her. The idea of emancipation, however, is many-sided, and its indefiniteness is increased by its association with many practical customs which have nothing to do with the theory of emancipation. By the term emancipation of a woman I imply neither her mastery at home nor her subjection of her husband. I have not in mind the courage which enables her to go freely by night or by day unaccompanied in public places, or the disregard of social rules which prohibit bachelor women from receiving visits from men, or discussing or listening to discussions of sexual matters. I exclude from my view the desire for economic independence, the becoming fit for positions in technical schools, universities and conservatoires or teachers’ institutes. And there may be many other similar movements associated with the word emancipation which I do not intend to deal with. Emancipation, as I mean to discuss it, is not the wish for an outward equality with man, but what is of real importance in the woman question, the deep-seated craving to acquire man’s character, to attain his mental and moral freedom, to reach his real interests and his creative power. I maintain that the real female element has neither the desire nor the capacity for emancipation in this sense. All those who are striving for this real emancipation, all women who are truly famous and are of conspicuous mental ability, to the first glance of an expert reveal some of the anatomical characters of the male, some external bodily resemblance to a man. Those so-called “women” who have been held up to admiration in the past and present, by the advocates of woman’s rights, as examples of what women can do, have almost invariably been what I have described as sexually intermediate forms. The very first of the historical examples, Sappho herself, has been handed down to us as an example of the sexual invert, and from her name has been derived the accepted terms for perverted sexual relations between women. The contents of the second and third chapter thus at once become important with regard to the woman question. The characterological material at our disposal with regard to celebrated and emancipated women is too vague to serve as the foundation of any satisfactory theory. What is wanted is some principle which would enable us to determine at what point between male and female such individuals were placed. My law of sexual affinity is such a principle. Its application to the facts of homo-sexuality showed that the woman who attracts and is attracted by other women is herself half male. Interpreting the historical evidence at our disposal in the light of this principle, we find that the degree of emancipation and the proportion of maleness in the composition of a woman are practically identical.