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18 differ, although in less degree? If through a surgical operation the breast from a male infant could be grafted in the proper place on a female infant, and the breast from a female infant on a male infant, the two individuals, as they became adult, would develop physically along the lines of his or her own sex except the grafted breast. That of the girl would remain flat, that of the boy would develop a mammary gland and become elevated into a mons. They each have on them a patch of the tissue of the opposite sex. In the passive invert there may exist one or more such patches from birth.

According to the author's theory,— whether any individual shall be a male or a female depends on the result of a battle in the embryo between the female corpuscles or germs of the egg and the male of the spermatozoa. From some cause, perhaps the relative state of vitality of the secretory sexual glands at the time of the formation of the particular egg and spermatozoon, either the female germs or the male germs happen to be the more vigorous, and determine the sex of the unborn. If the foetus develops into a female, it is because the female germs have devoured the male. For some reason, in exceptional cases, the more vigorous set of cells have not succeeded in devouring the other set entirely, and both kinds coexist in different parts of the same individual throughout his existence. In a male there may be only a single patch of female tissue—that is, tissue dominated in its development by the presence of the female bacteria—about the cheeks and neck, rendering him beardless, but with masculine habits of mind and the male sexual