Vulgar words in Darwin, and After Darwin (Vol. 1 and 3, of 3) - An Exposition of the Darwinian Theory and a Discussion of - Post-Darwinian Questions (Page 1)
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A horse, for instance, cannot be said to be more highly organized than a zebra or an ass; although the entire horse-genus is clearly a more highly organized type than any genus of animal which is not a mammal.