In the greater part of the structure that still remains in place, it is apparent that the brickwork was very roughly finished, and that the bitumen employed as mortar has been left where it has oozed out between the courses. The explanation is that the portions of the gateway which still stand are really foundations of the building, and were always intended to be buried below the pavement level. It is clear that the height of the road-way was constantly raised while the building of the gate was in progress, and there are traces of two temporary pavements,[105] afterwards filled in when the final pavement-level[106] was reached.[107] The visible portion of the gate above the last pavement has been entirely destroyed, but among its _débris_ were found thousands of fragments of the same two animals, but in enamelled brick of brilliant colouring, white and yellow against a blue ground. Some of these have been laboriously pieced together in Berlin, and specimens are now exhibited in the Kaiser Friedrich Museum and in the Imperial Ottoman Museum at Constantinople. Only one fragment of an enamelled portion of the wall was found in place,[108] and that was below the final pavement. It shows the legs of a bull above a band of rosettes with yellow centres.[109] [Illustration: FIG. 17. ENAMELLED FRAGMENT OF THE ISHTAR GATE STILL IN POSITION. The fragment, which was the highest portion of the gate preserved, is from the east side of the second doorway of the outer gate; cf. Figs. 14 and 15, No. 2. It stands just below the final pavement-level, and only the upper portion is enamelled.] The delicate modelling of the figures is to some extent obscured in the foundation specimens, but the imperfections there visible are entirely absent from the enamelled series. An examination of the latter shows that the bricks were separately moulded, and, before the process of enamelling, were burnt in the usual way. The contours of the figures were then outlined in black with a vitreous paste, the surfaces so defined being afterwards filled in with coloured liquid enamels. The paste of the black outlines and the coloured enamels themselves had evidently the same fusing point, for when fired they have sometimes shaded off into one another, giving a softness and a pleasing variety of tone to the composition.[110] It should be added that the enamelled beasts, like those in plain brick, are in slight relief, the same moulds having been employed for both. [Illustration: FIG. 18. PLAN OF THE LATER DEFENCES OF THE CITADEL UPON THE NORTH, SHOWING THE WALLS WITH THE LION FRIEZE AND THE ISHTAR GATE.