Close acquaintance with the geographical situation of the ancient sites of Iraq, and also of the Indus Valley, inevitably leaves two questions to haunt the mind. C Why did early man choose such inconvenient and inaccessible places, as many of them now are, for his settlements when he gave up nomad life ? And why after a site had been deliberately chosen for a city was it so frequently abandoned, though its occupation might already have extended through several centuries ?

These questions were first brought home to the writer in vivid fashion by a visit twenty years ago to the lonely and insignificant little mounds of Jemdet Nasr, some twenty-five miles from the ruins of Babylon and about halfway across the wide unin- habited desert between the lower Euphrates and Tigris rivers.