the 50% stated that he must have a college education;
95% of these were under twenty-one years of age; 50% did not state
his intellectual attainments.

Ninety-one per cent of all the ideals handed in were written by
persons under twenty years of age; the other 8-1/2% were over
twenty years of age.

_Physical Culture_, on another occasion, invited its male readers to
express their requirements of an ideal wife. The proportions of the
various elements desired are given as follows:

Per cent

Health 23
"Looks" 14
Housekeeping 12
Disposition 11
Maternity 11
Education 10
Management 7
Dress 7
Character 5
---
100

One might feel some surprise at the low valuation placed on "character,"
but it is really covered by other points. On the whole, one can not be
dissatisfied with these specifications aside from its slight concern
about mental ability.

Such wholesome ideals are probably rather widespread in the less
sophisticated part of the population. In other strata, social and
financial criteria of selection hold much importance. As a family
ascends in economic position, its standards of sexual selection are
likely to change. And in large sections of the population, there is a
fluctuation in the standards from generation to generation. There is
reason to suspect that the standards of sexual selection among educated
young women in the United States to-day are higher than they were a
quarter of a century, or even a decade, ago. They are demanding a higher
degree of physical fitness and morality in their suitors. Men, in turn,
are beginning to demand that the girls they marry shall be fitted for
the duties of home-maker, wife and mother,--qualifications which were
essential in the colonial period but little insisted on in the immediate
past.

(b) It is evident, then, that the standards of sexual selection do
change; there is therefore reason to suppose that they can change still
further. This is an important point, for it is often alleged as an
objection to eugenics that human affections are capricious and can not
be influenced by rational considerations. Such an objection will be
seen, on reflection, to be ill-founded.

As to the extent of change possible, the psychologist must have the
final word. The ingenious Mr. Diffloth,[97] who reduced love to a series
of algebraical f