They protest against being ascribed with all their conspicuous diversities to the offspring of one man, whose son, grandson, great-grandson and great-great-grandson, Shem, Arphaxad, Salah, and Eber, were actually still living during all these supposed revolutions. {27b} Indeed, if we go back from our 400 to our 4000 years, the protests on these points are almost equally forcible. In the matter of language, estimate how many generations must have passed away before the children of a common parent came to vary in speech as much as Chinese, Russians, Englishmen, and clucking Hottentots. Form some estimate of the time required for the rise and growth of civilization, not only in the old-world centres of Nineveh and Babylon and Egyptian Thebes, but in the separate and independent centres of Mexico and Peru. Explain, moreover, what, on the hypothesis of a common Noachian descent, must be called the rise and growth of barbarism. Show, if it be possible, how, amidst the rapid strides of civilization, side by side with the advancement of taste, literature and science, the descendants of Noah in some cases degenerated from all culture, sank away from all morality, lost all religion, forgot all useful arts, even those most essential to the lowest degree of comfort, the kindling of fire, the use of metals, the construction of dwellings, while they learned the habits, and acquired something more than the innocent shamelessness of brutes—learned to prefer the flesh of their own species to any other, learned to make a duty in some regions of putting their parents to death, in others, of eating their dead bodies. {28} Such customs we have on record four centuries before Christ, such customs on record as existing nineteen centuries after. Will any one attempt to persuade us that the savages of Andaman and the Feejee Islands are cousins, through an ancestor no more remote than Noah, of Chatham and Wilberforce, and Lesseps and Brunel?