18. But all these precautions were, in the long run, of little avail, so that it was frequently a simpler and less expensive proceeding for a king to build a new palace, than to keep repairing and propping up an old one which crumbled to pieces, so to speak, under the workmen's hands. It is not astonishing that sometimes, when they had to give up an old mansion as hopeless, they proceeded to demolish it, in order to carry away the stone and use it in structures of their own, probably not so much as a matter of thrift, as with a view to quickening the work, stone-cutting in the quarries and transport down the river always being a lengthy operation. This explains why, in some later palaces, slabs were found with their sculptured face turned to the crude brick wall, and the other smoothed and prepared for the artist, or with the sculptures half erased, or piled up against the wall, ready to be put in place. The nature of the injuries which caused the ancient buildings to decay and lose all shape, is very faithfully described in an inscription of the Babylonian king Nebuchadnezzar, in which he relates how he constructed the Ziggurat of Borsip on the site of an ancient construction, which he repaired, as far as it went. This is what he says: "The temple of the Seven Spheres, the Tower of Borsip which a former king had built ... but had not finished its upper part, from remote days had fallen into decay. The channels for drawing off the water had not been properly provided; rain and tempest had washed away its bricks; the bricks of the roof were cracked; the bricks of the building were washed away into heaps of rubbish." All this sufficiently accounts for the peculiar aspect offered by the Mesopotamian ruins. Whatever process of destruction the buildings underwent, whether natural or violent, by conquerors' hands, whether through exposure to fire or to stress of weather, the upper part would be the first to suffer, but it would not disappear, from the nature of the material, which is not combustible. The crude bricks all through the enormous thickness of the walls, once thoroughly loosened, dislodged, dried up or soaked through, would lose their consistency and tumble down into the courts and halls, choking them up with the soft rubbish into which they crumbled, the surplus rolling down the sides and forming those even slopes which, from a distance, so deceivingly imitate natural hills. Time, accumulating the drift-sand from the desert and particles of fertile earth, does the rest, and clothes the mounds with the verdant and flowery garment which is the delight of the Arab's eyes. [Illustration: 26.--WINGED LION WITH HUMAN HEAD. (Perrot and Chipiez.)]