2,459 words
One of the most serious obstacles to a purely biological formulation of the doctrine of race is the fact that cross-breeding and contamination of the blood are not the only cause of the decline and decay of races. Races may equally degenerate and come to their end because of a process – so to speak – of inner extinction, without the participation of external factors. In purely biological terms this may correspond to those enigmatic ‘inner variations’ (idiovariations) which science has been forced to recognize are just as powerful as variations due to cross-breeding in bringing about mutations.
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