The excavations which have been conducted on the sites of early Babylonian cities since the middle of last century have furnished material for the reconstruction of their history, but during different periods and for different districts it varies considerably in value and amount. While little is known of the earlier settlements in Akkad, and the very sites of two of its most famous cities have not yet been identified, our knowledge of Sumerian history and topography is relatively more complete. Here the cities, as represented by the mounds of earth and _débris_ which now cover them, fall naturally into two groups. The one consists of those cities which continued in existence during the later periods of Babylonian history. In their case the earliest Sumerian remains have been considerably disturbed by later builders, and are now buried deep beneath the accumulations of successive ages. Their excavation is consequently a task of considerable difficulty, and, even when the lowest strata are reached, the interpretation of the evidence is often doubtful. The other group comprises towns which were occupied mainly by the Sumerians, and, after being destroyed at an early date, were rarely, or never, reoccupied by the later inhabitants of the country. The mounds of this description, so far as they have been examined, have naturally yielded fuller information, and they may therefore be taken first in the following description of the early sites. The greater part of our knowledge of early Sumerian history has been derived from the wonderfully successful series of excavations carried out by the late M. de Sarzec at Tello,[1] between 1877 and 1900, and continued for some months in 1903 by Captain (now Commandant) Gaston Cros. These mounds mark the site of the city of Shirpurla or Lagash, and lie a few miles to the north-east of the modern village of Shatra, to the east of the Shatt el-Hai, and about an hour's ride from the present course of the stream. It is evident, however, that the city was built upon the stream, which at this point may originally have formed a branch of the Euphrates,[2] for there are traces of a dry channel upon its western side.