In Assyria it must have been seldom that the Babylonian system of irrigation could have been found applicable, and the water simply derived from the rivers by side-cuts, leading it off from the natural channel. There is but little of Assyria which is flat and alluvial; the land generally undulates, and most of it stands at a considerable height above the various streams. The water therefore requires to be raised from the level of the rivers to that of the lands before it can be spread over them, and for this purpose hydraulic machinery of one kind or another is requisite. In cases where the subterranean conduit was employed, the Assyrians probably (like the ancient and the modern Persians) sank wells at intervals, and raised the water from them by means of a bucket and rope, the latter working over a pulley. Where they could obtain a bank of a convenient height overhanging a river, they made use of the hand-swipe, and with its aid lifted the water into a tank or reservoir, whence they could distribute it over their fields. In some instances, it would seem, they brought water to the tops of hills by means of aqueducts, and then, constructing a number of small channels, let the fluid trickle down them among their trees and crops. They may have occasionally, like the modern Arabs, employed the labor of an animal to raise the fluid; but the monuments do not furnish us with any evidence of their use of this method. Neither do we find any trace of water-wheels, such as are employed upon the Orontes and other swift rivers, whereby a stream can itself be made to raise water from the land along its bunks. According to Herodotus, the kinds of grain cultivated in Assyria in his time were wheat, barley, sesame, and millet. As these still constitute at the present day the principal agricultural products of the county, we may conclude that they were in all probability the chief species cultivated under the Empire. The plough used, if we may judge by the single representation of it which has come down to us, was of a rude and primitive construction--a construction, however, which will bear comparison with that of the implements to this day in use through modern Turkey and Persia. Of other agricultural implements we have no specimens at all, unless the square instrument with a small circle or wheel at each corner, which appears on the same monument as the plough, may be regarded as intended for some farming purpose. [PLATE CXXXIV., Fig. 2.]