and Semites—­had to make in order to control the waters and to bring the land under culture:  the most ancient monuments exhibit them as already possessors of the soil, and in a forward state of civilization.* Their chief cities were divided into two groups:  one in the south, in the neighbourhood of the sea; the other in a northern direction, in the region where the Euphrates and Tigris are separated from each other by merely a narrow strip of land.  The southern group consisted of seven, of which Eridu lay nearest to the coast.  This town stood on the left bank of the Euphrates, at a point which is now called Abu-Shahrein.  A little to the west, on the opposite bank, but at some distance from the stream, the mound of Mugheir marks the site of Uru, the most important, if not the oldest, of the southern cities.  Lagash occupied the site of the modern Telloh to the north of Eridu, not far from the Shatt-el-Hai; Nisin and Mar, Larsam and Uruk, occupied positions at short distances from each other on the marshy ground which extends between the Euphrates and the Shatt-en-Nil.  The inscriptions mention here and there other less important places, of which the ruins have not yet been discovered—­Zirlab and Shurippak, places of embarkation at the mouth of the Euphrates for the passage of the Persian Gulf; and the island of Dilmun, situated some forty leagues to the south in the centre of the Salt Sea,—­“Nar-Marratum.”  The northern group comprised Nipur, the “incomparable;” Barsip, on the branch which flows parallel to the Euphrates and falls into the Bahr-i-Nedjif; Babylon, the “gate of the god,” the “residence of life,” the only metropolis of the Euphrates region of which posterity never lost a reminiscence; Kishu, Kuta, Agade;** and lastly the two Sipparas, that of Shamash and that of Anunit.  The earliest Chaldaean civilization was confined almost entirely to the two banks of the Lower Euphrates:  except at its northern boundary, it did not reach the Tigris, and did not cross this river.  Separated from the rest of the world—­on the east by the marshes which border the river in its lower course, on the north by the badly watered and sparsely inhabited table-land of Mesopotamia, on the west by the Arabian desert—­it was able to develop its civilization, as Egypt had done, in an isolated area, and to follow out its destiny in peace.  The only point from which it might anticipate serious danger was on the east, whence the Kashshi and the Elamites, organized into military states, incessantly harassed it year after year by their attacks.  The Kashshi were scarcely better than half-civilized mountain hordes, but the Elamites were advanced in civilization, and their capital, Susa, vied with the richest cities of the Euphrates, Uru and Babylon, in antiquity and magnificence.