For the service of such a building a liberal supply of water was necessary. Whence did it come? and how was it stored? I have been amazed to find that most of those who have studied the Assyrian palaces have never asked themselves these questions.[31] One might have expected to find the building provided, as is usual in hot countries, with spacious cisterns that could be easily filled during the rainy season; but neither at Khorsabad, Kouyundjik, nor Nimroud, have the slightest traces of any such tanks been found. With the materials at their disposal it would, perhaps, have been too difficult for the Assyrian builders to make them water-tight. Neither have any wells been discovered. Their depth must have been too great for common use. We must remember that the height of the mound has to be added to the distance below the ordinary surface of the country at which watery strata would be tapped. It is, on the whole, probable that the supply for the palace inmates was carried up in earthenware jars, and that the service occupied a string of women, horses, and donkeys, passing and repassing between the river, or rather the canal, that carried the waters of the Khausser to the very foot of the mound, and the palace, from morning until night.[32] * * * * * We have now concluded our study of the arrangements of an Assyrian palace, and we may safely affirm that those arrangements were not invented, all standing, by the architect of Sargon. They were suggested partly by the nature of the materials used, partly by the necessities to be met. The plan of an Assyrian palace must have grown in scale and consistence with the power of the Assyrian kings. As their resources became greater, and their engineers more skilled, increased convenience and a richer decoration was demanded from their architects. We have dwelt at length upon Khorsabad, because it affords the completest and best preserved example of a type often repeated in the course of ten or twelve centuries. In some respects, in its constructive processes and the taste of its decorations, for instance, the Assyrian palace resembled the other buildings of the country; its chief originality consisted in the number of its rooms and the principles on which they were distributed.