In the preceding passages I have spoken of all kinds of mechanical stimulation of the genital organs, and also of erections[25] occurring in small children. I now pass on to consider ejaculation. Whereas during normal intercourse in the sexually mature man and woman a fluid secretion is expelled, nothing of the kind is possible in children, at least such is the general opinion. Frequently, indeed, as regards the male sex, the end of childhood, properly speaking, is supposed to be indicated by the first ejaculation of semen. Matters are, however, by no means so simple as this. We have seen that the testicular secretion, the most important constituent of the semen, consists, as Fuerbringer[26] has pointed out, almost entirely of spermatozoa. But how is it in the case of children? The spermatozoa may be first formed at very varying ages. According to the investigations of Mantegazza,[27] they rarely make their appearance earlier than the eighteenth year of life. Fuerbringer does not unconditionally accept this view; but he has himself, as he has personally informed me, examined boys at ages of fifteen to sixteen in whom the ejaculation was entirely devoid of spermatozoa. But, on the other hand, he has found spermatozoa in the semen of a boy aged only twelve or thirteen years. I have myself examined the emissions of boys in a considerable number of cases, and have repeatedly found that, even in the case of boys of sixteen, the ejaculated secretions contained no spermatozoa. The reports of other investigators also show that as regards this point very wide individual variations occur. Hofmann[28] has contributed some data to this discussion. A case published by Klose, in which pregnancy is alleged to have resulted from intercourse with a boy aged nine years, is, indeed, regarded by Hofmann as probably apocryphal. But he had personal knowledge of a case in which a woman was impregnated by a boy fourteen years of age. He assumes that when a boy's general development is advanced (masculine habit of body, large penis, &c.), his reproductive capacity will also make its appearance at an earlier age. But he has met with exceptions to this generalisation. Thus, in the post-mortem examination of the body of a boy aged fourteen, whose physique was still quite infantile, he found well-developed spermatozoa both in the testicles and in the seminal vesicles. In the case of two boys aged fifteen years, in whom the genital organs were powerfully developed, he found in one abundant spermatozoa, but in the other none at all. In two other boys, also fifteen years of age, in whom the pubic hair had not yet appeared, spermatozoa were present. They were absent, again, in a young man of eighteen years. Similar variations were found by Haberda. Thus, for example, in two boys aged fifteen and seventeen years, respectively, he found no spermatozoa, notwithstanding the fact that in both the pubic hair had grown. On the other hand, in a