1. The recent discovery of the Chaldean deluge tablets has again directed attention to the statements of Berosus respecting the Babylonian tradition of a great flood, and these statements are found to be borne out in the main by the contents of the tablets. There is thus a twofold testimony as to the occurrence of a deluge in that Babylonian plain which the Old Testament history represents as the earliest seat of antediluvian man. As Lenormant has well shown, the tradition exists in the ancient literature of India, Persia, Phœnicia, Phrygia, and Greece, and can be recognised in the traditions of Northern and Western Europe and of America, while the Egyptians had a similar account of the destruction of men, but apparently not by water, though their idea of a submerged continent of Atlantis probably had reference to the antediluvian world. Thus we find this story widely spread over the earth, and possessed by members of all the leading divisions of mankind. This does not necessarily prove the universality of the Deluge, though every distinct people naturally refers it to its own country. It shows, however, the existence of some very early common source of the tradition, and the variations are not more than were to have been expected in the different of transmission. 2. Parallel with this historical evidence lies the result of geological and archæological research, which has revealed to us the remains and works of prehistoric men, racially distinct from those of modern times, and who inhabited the earth at a period when its animal population was to a great extent distinct from that at present existing, and when its physical condition was also in many respects different. Thus in Europe and Asia, and to some extent also in America, we have evidence that the present races of men were preceded by others which have passed away, and this at the same time with many important species of land animals, once the contemporaries of man, but now known only as fossils. These ancient men are those called by geologists later pleistocene, or post-glacial, or the men of the cave and gravel deposits, or of the age of the mammoth, and who have been designated by archæologists palæolithic men, or, more properly, palæocosmic men, since the character of their stone implements is only one not very important feature of their history, and implements of the palæolithic type have been used in all periods, and indeed are still used in some places.