Of the eastern side nothing is visible except on the north. Here we see that the pillars of the doors of the three arches of the broad passage-way do not exist below in the ancient building, as was only to be expected, as the eastern building was not yet in existence at that time. Near the corner is a groove forming an expansion joint for the wall that originally joined it at this place, the fortification wall of Nabopolassar, which must have united here with the line of the palace wall. Nebuchadnezzar, however, substituted for it a brick wall of his own, which he pushed farther to the north. The north front is in good preservation at this point and is very remarkable (Fig. 69). It is treated in the stepped or toothed fashion that we have already met with. As the deviation from the line of the walls of the building is very considerable, the steps are short, and on the façade, which is 80 metres long, there are 80 of these vertical steps, which give a unique appearance, to be met with in no other order of architecture. The stepped wall rests on a level foundation at the height at which Nabopolassar’s pavement must originally have been laid. At the same level a grid of poplar wood is inserted in the brickwork, and a beam is placed on each long side and another on the short side of each projection. This can be clearly seen in the photograph. Where the doorway leads to the passage to the court, the step is made larger in order to afford convenient space for the door. [Illustration: FIG. 69.—North wall of the Nabopolassar Palace. ] A large part of the ground-plan is still buried under rubbish, which up to the present time has prevented our gaining a clear idea of the general arrangement. The entrance from the east consists of a three-chambered building, which differs somewhat in arrangement from the usual plan of a gateway building. The towers that are found elsewhere at the sides of gateways of any importance are absent here. The first room, which is unusually spacious, affords access to the double house 37 and 38. Two doors lead to the chamber near the court, and two more direct to the court. At these doors there are still the great stone sockets of the hinges. Owing to uneven setting they became much distorted, but they were already in this condition when they were washed over with gypsum mortar.