1. Adam and Isha, the woman, afterward called Eve (Life-giver), in consequence of the promise of a Redeemer, commenced a life of husbandry on their expulsion from Eden, which, on the ordinary views of the Bible chronology, may be supposed to have occurred from 4000 to 5000 years before the Christian era; and during the lifetime of the primal pair, the sheep, at least, was domesticated. The Bible, of course, knows nothing of the imaginary continent of Lemuria, in which, according to some hypotheses, men are supposed to have had their birth from apes. A few generations after, in the time of Lamech, cattle were domesticated; and the metals copper and iron were applied to use--the latter probably meteoric iron; and hence, it may be, the Hindoo and Hellenic myths of Twachtrei and Hephaestos in connection with the thunderbolt. We learn, however, incidentally, as already mentioned, in the description of Eden in Genesis, chapter 2d, that there was a previous stone age, in which "flint, pearls or shell beads, and stream-gold" were the chief treasures of man, for this is implied in the "gold, bedolach, and onyx" of the land of Havilah. It is certain also, from the discoveries made in Assyria, on the site of Troy, and elsewhere, that the use of stone implements continued in Western Asia long after the deluge. In the time of Noah the distinction of clean and unclean beasts, and the taking of seven pairs of certain beasts and birds into the ark, imply that certain mammals and birds were domesticated.[108] 2. Before the flood, as already remarked, there was a division of man into two nationalities or races; and there was a citizen, an agricultural, a pastoral, and a nomadic population. Farther, the remarkable progress in the arts implied in the building of such structures as the Tower of Babel, and other temple and palace mounds in Assyria, and of the pyramids of Egypt, within a few generations after the deluge, proves that a very advanced material civilization and great skill in constructive arts had been reached in antediluvian times.[109]