Capitolo 6
once with another, when we take a spread out series of cases me,
you think, is almost shown by sure and certain guarantee of human creature
nature.
Brothers and sisters have in common, mentally and physically, that
some other members of the same run can possibly have with each other.
But nobody falls in love him of his/her sister. A deep instinct has taught
also the lowest runs of men (to a large extent) to avoid such union of
the all-but-identical one. In the tallest runs the idea never so a lot as
it happens to us. Also cousins rarely fall in love him--that rarely, has to say,
I respect with the their frequent opportunities of relationships they enjoy,
relatively to the rest of general society. When they does, and when
they effectively performs their dangerous choice from marriage, natural
selection avenges soon Nature on the descendant cutting the
idiots, the consumptives, the sickly individuals and the lame one that often
both the result of so akin marriages. In narrow community, where
crossing in-and-in it becomes almost inevitable selection, natural it has
likewise to practice himself/herself/themselves on a crowd of _cretins_ and other unlucky
incapables. But in countries of wide and open champaign, where individual
choice has free space for exercise, men and women as a rule (if not
forced by parents and moralists) you get married him for love, and you get married him on the
whole their natural complements. They prefers outsider fresh blood,,
someone whom comes from over the community, to the people of them really
immediate outskirtses. In many men the antipathy to getting married himself/herself/itself among the
I populate with whom they has almost been brought on amounts to a positive
instinct; they feel him/it to them as impossible to fall in love himself/herself/themselves with a
individual-townswoman as to fall in love himself/herself/themselves with them his/her cousins really before. Among
tribe of exogamous such instinct (it helped, clearly, from other extraneous
causes) you/he/she has hardened in custom; and there is reason to believe (from