Page:Geological Evidences of the Antiquity of Man.djvu/405

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HEN speaking in a former work of the distinct races of mankind, I remarked that, 'if all the leading varieties of the human family sprang originally from a single pair,' (a doctrine, to which then, as now, I could see no valid objection,) 'a much greater lapse of time was required for the slow and gradual formation of such races as the Caucasian, Mongolian, and Negro, than was embraced in any of the popular systems of chronology.'

In confirmation of the high antiquity of two of these, I referred to pictures on the walls of ancient temples in Egypt, in which, a thousand years or more before the Christian era,