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 conditions, that these conditions may present different degrees of development. Such a conception of the existence of different degrees of development in sexuality makes it easy to understand cases of false hermaphroditism or even of the true hermaphroditism, which, since the time of Steenstrup, has been established for so many plants and animals, although not certainly in the case of man. Steenstrup wrote: "If the sex of an animal has its seat only in the genital organs, then one might think it possible for an animal really to be bisexual, if it had at the same time two sets of sexual organs. But sex is not limited to one region, it manifests itself not merely by the presence of certain organs; it pervades the whole being and shows itself in every point. In a male body, everything down to the smallest part is male, however much it may resemble the corresponding female part, and so also in the female the smallest part is female. The presence of male and female sexual organs in the same body would make the body bisexual only if both sexes ruled the whole body and made themselves manifest in every point, and such a condition, as the manifestations of the sexes are opposing forces, would result simply in the negation of sex in the body in question." If, however, the principle of the existence of innumerable sexually transitional conditions be extended to all the cells of the body, and empirical knowledge supports such a view, Steenstrup's difficulty is resolved, and hermaphroditism no longer appears to be unnatural. There may be conceived for every cell all conditions, from complete masculinity through all stages of diminishing masculinity to its complete absence and the consequent presence of complete femininity. Whether we are to think of these gradations in the scale of sexual differentiation as depending on two real substances united in different proportions, or as a single kind of protoplasm modified in different ways (as, for instance, by different spatial dispositions of its molecules), it were wiser not to guess. The first conception is difficult to apply physiologically; it is extremely difficult to imagine that two sets of conditions should be able to produce the