As a theory of adaptation, then, natural selection is

satisfactory only in so far as it accounts for the
'preservation of favored races
As a theory of adaptation, then, natural selection is
satisfactory only in so far as it accounts for the
'preservation of favored races.' It throws no light upon the
origin of the variations with which races are favored. Since it
is only as variations possess a certain utility for the
organism that they become known as adaptations, the conception
of adaptation is inevitably associated with the welfare of
individuals or the survival of races. To disregard this
association is to rob the conception of all meaning. Like
health, it has no elementary physiological significance.