With regard to the uses whereto the Assyrians applied the arch, it would certainly seem, from the evidence which we possess, that they neither employed it as a great decorative feature, nor yet as a main principle of construction. So far as appears, their chief use of it was for doorways and gateways. Not only are the town gates of Khorsabad found to have been arched over, but in the representations of edifices, whether native or foreign, upon the bas-reliefs, the arch for doors is commoner than the square top. It is most probable that the great palace gateways were thus covered in, while it is certain that some of the interior doorways in palaces had rounded tops. Besides this use of the arch for doors and gates, the Assyrians are known to have employed it for drains, aqueducts, and narrow chambers or galleries. [PLATE LVIII. Fig. 2.]; [PLATE LIX., Fig. 1.]
It has been suggested that the Assyrians applied the two kinds of arches to different purposes, “thereby showing more science and discrimination than we do in our architectural works;” that “they used the pointed arch for underground work, where they feared great superincumbent pressure on the apex, and the round arch above ground, where that was not to be dreaded.” [PLATE LIX., Fig. 2.] But this ingenious theory is scarcely borne out by the facts. The round arch is employed underground in two instances at Nimrud, besides occurring in the basement story of the great tower, where the superincumbent weight must have been enormous. And the pointed arch is used above ground for the aqueduct and hanging garden in the bas-relief (see [PLATE XLIX., Fig. 4]), where the pressure, though considerable, would not have been very extraordinary. It would seem, therefore, to be doubtful whether the Assyrians were really guided by any constructive principle in their preference of one form of the arch over the other.
In describing generally the construction of the palaces and other chief buildings of the Assyrians, it has been necessary occasionally to refer to their ornamentation; but the subject is far from exhausted, and will now claim, for a short space, our special attention. Beyond a doubt the chief adornment, both of palaces and temples, consisted of the colossal bulls and lions guarding the great gateways, together with the sculptured slabs wherewith the walls, both internal and external, were ordinarily covered to the height of twelve or sometimes even of fifteen feet. These slabs and carved figures will necessarily be considered in connection with Assyrian sculpture, of which they form the most important part. It will, therefore, only be noted at present that the extent of wall covered with the slabs was, in the Khorsabad palace, at least 4000 feet, or nearly four-fifths of a mile, while in each of the Koyunjik palaces the sculptures extended to considerably more than that distance.
The ornamentation of the walls above the slabs, both internally and externally, was by means of bricks painted on the exposed side and covered with an enamel. The colors are for the most part somewhat pale, but occasionally they possess some brilliancy. [PLATE LX., Fig 1.] Predominant among the tints are a pale blue, an olive green, and a dull yellow. White is also largely used; brown and black are not infrequent; red is comparatively rare. The subjects represented are either such scenes as occur upon the sculptured slabs, or else mere patterns—scrolls, honeysuckles, chevrons, gradines, guilloches, etc. In the scenes some attempt seems to be made at representing objects in their natural colors. The size of the figures is small; and it is difficult to imagine that any great effect could have been produced on the beholder by such minute drawings placed at such a height from the ground. Probably the most effective ornamentation of this kind was by means of patterns, which are often graceful and striking. [PLATE LX., 2.]
It has been observed that, so far as the evidence at present goes, the use of the column in Assyrian architecture would seem to have been very rare indeed. In palaces we have no grounds for thinking that they were employed at all excepting in certain of the interior doorways, which, being of unusual breadth, seem to have been divided into three distinct portals by means of two pillars placed towards the sides of the opening. The bases of these pillars were of stone, and have been found in situ; their shafts and capitals had disappeared, and can only be supplied by conjecture. In the temples, as we have seen, the use of the column was more frequent. Its dimensions greatly varied. Ordinarily it was too short and thick for beauty, while occasionally it had the opposite defect, being too tall and slender. Its base was sometimes quite plain, sometimes diversified by a few mouldings, sometimes curiously and rather clumsily rounded (as in No. II., [PLATE LXI., Fig. 1]). The shaft was occasionally patterned. The capital, in one instance (No. I., [PLATE LXI., Fig. 3]), approaches to the Corinthian; in another (No. II.) it reminds us of the Ionic; but the volutes are double, and the upper ones are surmounted by an awkward-looking abacus. A third (No. III., [PLATE. LXI., Fig. 2]) is very peculiar, and to some extent explains the origin of the second. It consists of two pairs of ibex horns, placed one over the other. With this maybe compared another (No. IV.). the most remarkable of all, where we have first a single pair of ibex horns, and then, at the summit, a complete figure of an ibex very graphically portrayed.
The beauty of Assyrian patterning has been already noticed. Patterned work is found not only on the enamelled bricks, but on stone pavement slabs, and around arched doorways leading from one chamber to another, where the patterns are carved with great care and delicacy upon the alabaster. The accompanying specimen of a doorway, which is taken from an unpublished drawing by Mr. Boutcher, is very rich and elegant, though it exhibits none but the very commonest of the Assyrian patterns. [PLATE LXII., Fig. 1.] A carving of a more elaborate type, and one presenting even greater delicacy of workmanship, has been given in an earlier portion of this chapter as an example of a patterned pavement slab. Slabs of this kind have been found in many of the palaces, and well deserve the attention of modern designers.