The abundance of produce rendering subsistence easy, population was rapid and numerous, and states attained quickly the term of their plenitude. Productions increasing beyond consumption, the necessity of commerce arose; and exchanges took place between people and people; which augmented their activity and reciprocal advantages. In fine, certain countries, at certain times, uniting the advantages of good government with a position on the route of the most active circulation, they became emporiums of flourishing commerce and seats of powerful domination. And on the shores of the Nile and Mediterranean, of the Tygris and Euphrates, the accumulated riches of India and of Europe raised in successive splendor a hundred different cities. The people, growing rich, applied their superfluity to works of common and public use; and this was in every state, the epoch of those works whose grandeur astonishes the mind; of those wells of Tyre, of those dykes of the Euphrates, of those subterranean conduits of Media,* of those fortresses of the desert, of those aqueducts of Palmyra, of those temples, of those porticoes. And such labors might be immense, without oppressing the nations; because they were the effect of an equal and common contribution of the force of individuals animated and free. * See respecting these monuments my Travels into Syria, vol. ii. p. 214. From the town or village of Samouat the course of the Euphrates is accompanied with a double bank, which descends as far as its junction with the Tygris, and from thence to the sea, being a length of about a hundred leagues, French measure. The height of these artificial banks is not uniform, but increases as you advance from the sea; it may be estimated at from twelve to fifteen feet. But for them, the inundation of the river would bury the country around, which is flat, to an extent of twenty or twenty-five leagues and even notwithstanding these banks, there has been in modern times an overflow, which has covered the whole triangle formed by the junction of this river to the Tygris, being a space of country of one hundred and thirty square leagues. By the stagnation of these waters an epidemical disease of the most fatal nature was occasioned. It follows from hence, 1. That all the flat country bordering upon these rivers, was originally a marsh; 2. That this marsh could not have been inhabited previously to the construction of the banks in question; 3. That these banks could not have been the work but of a population prior as to date; and the elevation of Babylon, therefore, must have been posterior to that of Nineveh, as I think I have chronologically demonstrated in the memoir above cited. See Encyclopedia, vol. xiii, of Antiquities.