anticipating any discovery of the future (it is plain already, however, that the specific phenomena of living matter are not going to be referred to chemistry and physics), it may be taken for granted that individual cells possess sexuality in different degrees quite apart from the sexuality of the whole body. Womanish men usually have the skin softer, and in them the cells of the male organs have a lessened power of division upon which depends directly the poorer development of the male macroscopic characters. The distribution of sexual characters affords an important proof of the appearance of sexuality in different degrees. Such characters (at least in the animal kingdom) may be arranged according to the strength of their exciting influence on the opposite sex. To avoid confusion, I shall make use of John Hunter’s terms for classifying sexual characters. The primordial sexual characters are the male and female genital glands (testes and epididymis, ovaries and epoophoron); the primary sexual characters are the internal appendages of the sexual glands (vasa deferentia vesiculæ seminales, oviducts and uterus), which may have sexual characters quite distinct from those of the glands and the external sexual organs, according to which alone the sex of human beings is reckoned at birth (sometimes quite erroneously, as I shall show) and their consequent fate in life decided. After the primary, come all those sexual characters not directly necessary to reproduction. Such secondary sexual characters are best defined as those which begin to appear at puberty, and which cannot be developed except under the influence on the system of the internal secretions of the genital glands. Examples of these are the beards in men, the luxuriant growth of hair in women, the development of the mammary glands, the character of the voice. As a convenient mode of treatment, and for practical rather than theoretical reasons, certain inherited characters, such as the development of muscular strength or of mental obstinacy may be reckoned as tertiary sexual characters. Under the designation “quaternary sexual characters” may be placed such accessories as relative social position, difference in habit, mode of livelihood, the smoking and drinking habit in man, and the domestic duties of women. All these characters possess a potent and direct sexual influence, and in my opinion often may be reckoned with the tertiary characters or even with the secondary. This classification of sexual characters must not be taken as implying a definite chain of sequence, nor must it be assumed that the mental sexual characters either determine the bodily characters or are determined by them in some causal nexus. The classification relates only to the strength of the exciting influence on the other sex, to the order in time in which this influence is exerted, and to the degree of certainty with which the extent of the influence may be predicted.