The desirability of selecting a wife (or husband) from a family of more
than one or two children was emphasized by Benjamin Franklin, and is
also one of the time-honored traditions of the Arabs, who have always
looked at eugenics in a very practical, if somewhat cold-blooded way. It
has two advantages: in the first place, one can get a better idea of
what the individual really is, by examining sisters and brothers; and in
the second place, there will be less danger of a childless marriage,
since it is already proved that the individual comes of a fertile stock.
Francis Galton showed clearly the havoc wrought in the English peerage,
by marriages with heiresses (an heiress there being nearly always an
only child). Such women were childless in a much larger proportion than
ordinary women.
"Marrying a man to reform him" is a speculation in which many women have
indulged and usually--it may be said without fear of contradiction--with
unfortunate results. It is always likely that she will fail to reform
him; it is certain that she can not reform his germ-plasm. Psychologists
agree that the character of a man or woman undergoes little radical
change after the age of 25; and the eugenist knows that it is largely
determined, _potentially_, when the individual is born.
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