It could not have been long after this that the cities of the plain were destroyed "with brimstone and fire from the Lord out of heaven." The expression is found in the cuneiform tablets of Babylonia. Old Sumerian hymns spoke of a "rain of stones and fire," though the stones may have been hail-stones and thunderbolts, and the fire the flash of the lightning. But whatever may have been the nature of the sheet of flame which enveloped the guilty cities of the plain and set on fire the naphtha-springs that oozed out of it, the remembrance of the catastrophe survived to distant ages. The prophets of Israel and Judah still refer to the overthrow of Sodom and its sister cities, and St. Jude points to them as "suffering the vengeance of eternal fire." Some scholars have seen an allusion to their overthrow in the tradition of the Phoenicians which brought their ancestors into the coastlands of Canaan in consequence of an earth-quake on the shores of "the Assyrian Lake." But the lake is more probably to be looked for in the neighbourhood of the Persian Gulf than in the valley of the Jordan. The vale of Siddim, and "the cities of the plain," stood at the northern end of the Dead Sea. Here were the "slime-pits" from which the naphtha was extracted, and which caused the defeat of the Canaanitish princes by the Babylonian army. The legend which placed the pillar of salt into which Lot's wife was changed at the southern extremity of the Dead Sea was of late origin, probably not earlier than the days when Herod built his fortress of Machaerus on the impregnable cliffs of Moab, and the name of Gebel Usdum, given by the modern Arabs to one of the mountain-summits to the south of the sea proves nothing as to the site of the city of Sodom. Names in the east are readily transferred from one locality to another, and a mountain is not the same as a city in a plain. There are two sufficient reasons why it is to the north rather than to the south that we must look for the remains of the doomed cities, among the numerous tumuli which rise above the rich and fertile plain in the neighbourhood of Jericho, where the ancient "slime-pits" can still be traced. Geology has taught us that throughout the historical period the Dead Sea and the country immediately to the south of it have undergone no change. What the lake is to-day, it must have been in the days of Abraham. It has neither grown nor shrunk in size, and the barren salt with which it poisons the ground must have equally poisoned it then. No fertile valley, like the vale of Siddim, could have existed in the south; no prosperous Canaanitish cities could have grown up among the desolate tracts of the southern wilderness. As we are expressly told in the Book of Numbers (xiii. 29), the Canaanites dwelt only "by the coast of Jordan," not in the desert far beyond the reach of the fertilizing stream.