It is certain that the alluvium at the head of the Persian Gulf now grows with extraordinary rapidity, and not improbable that the growth may in ancient times have been even more rapid than it is at present.

Accurate observations have shown that the present rate of increase amounts to as much as a mile each seventy years, while it is the opinion of those best qualified to judge that the average progress during the historic period has been as much as a mile in every thirty years! Traces of post-tertiary deposits have been found as far up the country as Tel Ede and Hammam, 10 or more than 200 miles from the embouchure of the Shat-el-Arab; and there is ample reason for believing that at the time when the first Chaldaean monarchy was established, the Persian Gulf reached inland, 120 or 130 miles further than at present.

We must deduct therefore from the estimate of extent grounded upon the existing state of things, a tract of land 130 miles long and some 60 or 70 broad, which has been gained from the sea in the course of about forty centuries.

This deduction will reduce Chaldaea to a kingdom of somewhat narrow limits; for it will contain no more than about 23,000 square miles.

This, it is true, exceeds the area of all ancient Greece, including Thessaly, Acarnania, and the islands; it nearly equals that of the Low Countries, to which Chaldaea presents some analogy; it is almost exactly that of the modern kingdom of Denmark; but it is less than Scotland, or Ireland, or Portugal, or Bavaria; it is more than doubled by England, more than quadrupled by Prussia, and more than octupled by Spain, France, and European Turkey.