man
will convey haemophilia and another will not. The abnormality is present
in her, but it is latent; or, as we shall see the Mendelians would say,
"recessive" instead of "dominant."

Now I am well assured that if we could study not only the patencies but
also the latencies of individuals of both sexes, we should find that
they vary equally. Women, as individuals, appear more similar than men,
but as individuals conveying latent or "recessive" characters which will
appear in their children, especially their male children, they are just
as various as men are. The instance of haemophilia is conclusive, for two
women, each equally free from it, will respectively bear normal and
haemophilic children; but this is probably only one among many far more
important cases. I incline to believe that certain nervous qualities,
many of great value to humanity, tend to be latent in women, just as
haemophilia does. Two women may appear very similar in mind and capacity,
but one may come of a distinguished stock, and the other of an
undistinguished. In the first woman, herself unremarkable, high ability
may be latent, and her sons may demonstrate it. It is therefore every
whit as important that the daughters of able and distinguished stock
shall marry as that the sons shall. It remains true even though the
sons may themselves be obviously distinguished and the daughters may
not.

The conclusion of this matter is that scientific inquiry completely
demonstrates the equal importance of the selection of fathers and of
mothers. If our modern knowledge of heredity is to be admitted at all,
it follows that the choice of women for motherhood is of the utmost
moment for the future of mankind. Woman is half the race; and the
leaders of the woman's movement must recognize the importance of their
sex in this fundamental question of eugenics. At present they do not do
so; indeed, no one does. But the fact remains. As before all things a
Eugenist, and responsible, indeed, for that name, I cannot ignore it in
the following pages. There is not only to-day to think of, but
to-morrow. The eugenics which ignores the natural differences between
women as individuals, and their still greater natural differences as
potential parents, is only half eugenics; the leading women who in any
way countenance such measures as deprive the blood of the future of its
due contribution from the best women of the present, are leading not
only one sex but the race as a wh