Fortunately, however, the greater weight of biological and archaeological evidence is here on the side of the Bible, and philology comes in with strong corroborative proof. But just as the orthodox theologian is beginning to congratulate himself on the aid he has thus received, some of his new friends gravely tell him that, in order to maintain their view, it is necessary to believe that man has resided on earth for countless ages, and that it is quite a mistake to suppose that his starting-point is so recent as the Mosaic deluge. Nay, some very rampant theorists of some ethnological schools try to pierce Moses and his abettors with both horns of the dilemma at once, maintaining that men may be of different species, and yet may have existed for an enormous length of time as well. The recent prevalence of theories of evolution has, however, thrown quite into the background the discussions formerly active respecting the unity of man, but has, along with geological and archaeological discovery, given increased prominence to those relating to the date of the origin of our species and the manner of its introduction. The Bible gives us a definite epoch, that of the deluge, about 2000 to 3000 B.C., for all existing races of men; but this, according to it, was only the second starting-point of humanity, and though no family but that of Noah survived the terrible catastrophe, it would be a great error to suppose that nothing antediluvian appears in the subsequent history of man. Before the deluge there were arts and an old civilization, extending over at least two thousand years, and after the deluge men carried with them these heirlooms of the old world to commence with them new nations. This has been tacitly ignored by many of the writers who underrate the value of the Hebrew history. It may be as well for this reason to place, in a series of propositions, the principal points in Genesis which relate to the questions now before us.