It is surprising how soon a want of care, or care wrongly directed, leads to the degeneration of a domestic race; but excepting in the case of man himself, hardly any one is so ignorant as to allow his worst animals to breed.
Source:(John Murray, ed. 1871), Volume I, Part I. On the Descent of Man, Chapter V. On the Development of the Intellectual and Moral Faculties during Primeval and Civilised Times, Page 168
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