to be made, and through the commercial activity that, upon the union of the various Babylonian districts, set in with increased vigor. Attention was directed a few years ago by Pognon and Sayce to the fact that the name of Hammurabi, as well as the names of four kings that preceded him, and of a number that followed, are not Babylonian. Sayce expressed the opinion that they were Arabic, and Professor Hommel has recently reenforced the position of Sayce by showing the close resemblance existing between these names and those found on the monuments of Southern Arabia.[21] While no evidence has as yet been found to warrant us in carrying back the existence of the Minean empire in Southern Arabia beyond 1500 B.C., still since at this period, this empire appears in a high state of culture, with commercial intercourse established between it and Egypt, as well as Palestine, the conclusion drawn by Hommel that Babylonia was invaded about 2500 B.C. by an Arabic-speaking people is to be seriously considered. Elam, as we have seen, was constantly threatening Babylonia from the East, and shortly before Hammurabi's appearance, succeeded in putting an end to the dynasty of Larsa. It now appears that the inhabitants of the Euphrates Valley were also threatened by an enemy lodged somewhere in the southwest. Though Hommel's hypothesis still needs confirmation, and may perhaps be somewhat modified by future researches, still so much seems certain: that the great union of the Babylonian states and the supremacy of the city of Babylon itself was achieved not by Babylonians but by foreigners who entered Babylonia from its western (or southwestern) side. The dynasty of which Hammurabi is the chief representative comes to an end _c._ 2100, and is followed by another known as Shish-Kha,[22] whose rulers likewise appear to be foreigners; and when this dynasty finally disappears after a rule of almost four centuries, Babylonia is once more conquered by a people coming from the northern parts of Elam and who are known as the Cassites.[23] These Cassites, of whose origin, character, and language but little is known as yet, ruled over Babylonia for a period of no less than 576 years; but adapting themselves to the customs and religion of the country, their presence did not interfere with the normal progress of culture in the Euphrates Valley. We may therefore embrace the period of Hammurabi and his successors, down through the rule of the Cassite kings, under one head. It is a period marked by the steady growth of culture, manifesting itself in the erection of temples, in the construction of canals, and in the expansion of commerce. Active relationships were maintained between Babylonia and distant Egypt.