education does become a concern of eugenics. Young men are more and more coming to demand that their wives know something about woman's work, and this demand must not only increase, but must be adequately met. Woman's education is treated in more detail in another chapter.
It is proper to point out here, however, that in many cases woman's education gives no great opportunity to judge of her real intellectual ability. Her natural endowment in this respect should be judged also by that of her sisters, brothers, parents, uncles, aunts and grandparents. If a girl comes of an intellectual ancestry, it is likely that she herself will carry such traits germinally, even if she has never had an opportunity to develop them. She can, then, pass them on to her own children. Francis Galton long ago pointed out the good results of a custom obtaining in Germany, whereby college professors tended to marry the daughters or sisters of college professors. A tendency for men of science to marry women of scientific attainments or training is marked among biologists, at least, in the United States; and the number of cases in which musicians intermarry is striking. Such assortative mating means that the offspring will usually be well endowed with a talent.