 Primitive man, we are to believe, had a feeble and narrow intellect, which in the progress of civilization has been gradually strengthened and enlarged.  This conclusion is supposed to be in accordance with the development theory; and the distinguished author of that theory has seemed to favor this view.  Yet, in fact, the development theory has nothing to do with the question.  If we suppose that the existing and--so far as we know--the only species of man appeared upon the earth with the physical conformation and mental capacity which he retains at this day, we make merely the same supposition with regard to him that we make with regard to every other existing species of animal. How it was that this species came to exist is another question altogether.