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 southwards to Central Africa. These people shaved their heads and wore simple tunic-like garments of wool. They settled first on the lower courses of the great river and not very far from the Persian Gulf, which in those days ran up for a hundred and thirty miles and more beyond its present head. They fertilized their fields by letting water run through irrigation trenches, and they gradually became very skilful hydraulic engineers; they had cattle, asses, sheep, and goats, but no horses; their collections of mud huts grew into towns, and their religion raised up towerlike temple buildings.

Clay, dried in the sun, was a very great fact in the lives of these people. This lower country of the Euphrates-Tigris valleys had little or no stone. They built of brick, they made pottery and earthenware images, and they drew and presently wrote upon thin tile-like cakes of clay. They do not seem to have had paper or to have used parchment. Their books and memoranda, even their letters, were potsherds.

At Nippur they built a great tower of brick to their chief god, El-lil (Enlil), the memory of which is supposed to be preserved in the story of the Tower of Babel. They seem to have been divided up into city states, which warred among themselves and maintained for many centuries their military capacity. Their soldiers carried long spears and shields, and fought in close formation. Sumerians conquered Sumerians. Sumeria remained unconquered by any stranger race for a very long period of time indeed. They developed their civilization, their writing, and their shipping, through a period that may be twice as long as the whole period from the Christian era to the present time.

The first of all known empires was that founded by the high priest of the god of the Sumerian city of Erech. It reached, says an inscription at Nippur, from the Lower (Persian Gulf) to the Upper (Mediterranean or Red?) Sea. Among the mud heaps of the Euphrates-Tigris valley the record of that vast period of history, that first half of the Age of Cultivation, is buried. There flourished the first temples and the first priest-rulers that we know of among mankind.