In the first place the reader will recognize those semicircular pilasters or gigantic reeds to which we have already alluded as strongly characteristic of Chaldæan architecture, and one of the most certain signs of its origin. The chevrons, the spiral lines and lozenges of the coloured decoration with which the semi-columns, and the salient buttress by which they are divided into two groups, are covered, should be curiously noticed. The ornament varies with each structural division. Loftus, however, was chiefly struck by the process used to build up the design. The whole face of the wall is composed of terra-cotta cones ([Fig. 120]) engaged in a mortar composed of mud mixed with chopped straw. The bases of these cones are turned outwards and form the surface of the wall. Some preserve the natural colour of the terra-cotta, a dark yellow, others have been dipped—before fixing no doubt—in baths of red and black colouring matter. By the aid of these three tints an effect has been obtained that, according to Loftus, is far from being disagreeable. The process may be compared to that of mosaic, cones of terra-cotta being substituted for little cubes of coloured stone or glass.[350]
Fig. 120.—Cone with coloured base; from Loftus. Upon the same site M. Loftus found traces of a still more singular decoration. A mass of crude brick had its horizontal courses divided from each other by earthenware vases laid so that their open mouths were flush with the face of the wall. Three courses of these vases were placed one upon another, and the curious ornament thus made was repeated three times in the piece of wall left standing. The vases were from ten to fifteen inches long externally, but inside they were never more than ten inches deep, so that their conical bases were solid.[351] The dark shadows of their open mouths afforded a strong contrast with the white plaster which covered the brickwork about them. The consequent play of light and shadow unrelieved by colour was pleasing enough. In spite, however, of their thick walls, these vases could hardly resist successfully the weight of the bricks above and the various disintegrating influences set up by their contraction in drying. Most of the vases were broken when Loftus saw them, though still in place.
Cone mosaics and the insertion of vases among the bricks afforded after all but a poor opportunity to the decorative architect. Had the builders of Chaldæa possessed no more efficient means than these of obtaining beauty, their structures would hardly have imposed themselves as models upon their rich and powerful neighbours of Assyria so completely as they did. Some process was required which should not restrict the decorator to the curves and straight lines of the simpler geometrical figures, which should allow him to make use of motives furnished by the animal and vegetable kingdom, by man and those fanciful creations of man's intellect that resulted from his attempts to figure the gods. We can hardly doubt that the Chaldæans, like their northern neighbours, made frequent use of paint in the decoration of the wide plaster walls that offered such a tempting surface to the brush. No fragment of such work has come down to us, but we have every reason to believe that the arrangement of motives and the choice of lines were the same as in Assyria. We may look upon the mural paintings in the Ninevite palaces as copies preserving for us the leading characteristics of their Chaldæan originals.
Even in Chaldæa, which had a drier climate than Assyria, paintings in distemper could not have had any very long life on external walls. They had not to do with the sky of Upper Egypt where years pass away without the fall of a single shower. Some means of fixing colour so that it should not be washed away by the first rain was sought, and it was found in the invention of enamel, in the coating of the bricks with a coloured material that when passed with them through the fire would be vitrified and would sink to some extent into their substance. A brick thus coated could never lose its colour; the latter became insoluble, and so intimately combined with the block to which it was attached that one could hardly be destroyed without the other. Sir H. Layard tells us that many fragments of brick found in the Kasr were covered with a thick glaze, the colours of which had in no way suffered with time. Fragments of ornaments and figures could be distinguished on some of them. The colours most often found were a very brilliant blue, red, dark yellow, white, and black.[352]
We have again to look to the Assyrian ruins for information as to the way in which these enamelled bricks were composed into pictures. No explorer has found anything in the remains of a Chaldæan city that can be compared to the archivolt of enamelled bricks discovered by M. Place over one of the gateways of the city founded by Sargon.[353]
We can hardly doubt however that the art of the enameller was discovered in Chaldæa and thence transported into Assyria. Everything combines to give us that assurance, an examination of the ruins in Mesopotamia and of the objects brought from them as well as the explicit statements of the ancients.
Every traveller tells that there is not a ruin at Babylon in which hundreds of these enamelled bricks may not be picked up, and they are to be found elsewhere in Chaldæa.[354] A certain number of fragments are now in the British Museum and the Louvre with indications upon them leaving no doubt as to whence they came.[355] As for the blocks of the same kind coming from Nineveh and its neighbourhood they are very numerous in our collections. It is easy therefore to compare the products of Chaldæan workshops with those of Assyrian origin. The comparison is not to the advantage of the latter. The enamel on the Babylonian bricks is very thick and solid; it adheres strongly to the clay, and even when brought to our comparatively humid climates it preserves its brilliancy. It is not so with bricks from Khorsabad and Nimroud, which rapidly tarnish and become dull when withdrawn from the earth that protected them for so many centuries. Their firing does not seem to have been sufficiently prolonged.[356]
Necessity is the mother of invention, the proverb says. If there be any country in which clay has been compelled to do all that lay in its power it must surely be that in which there was no other material for the construction and decoration of buildings. The results obtained by the enameller were pretty much the same in Assyria and Chaldæa, and we are inclined to look upon the older of the two nations as the inventor of the process, especially as it could hardly have done without it so well as its younger rival, and in this opinion we are confirmed by the superior quality of the Babylonian enamel. It is possible that there may be some truth in the assertion that most of the glazed bricks that have come down to us belonged to the restorations of Nebuchadnezzar; but even supposing that to be so, they show a technical skill so consummate and sure of itself that it must then have been very far removed from its infancy. The fatherland of the enameller is Southern Mesopotamia and especially Babylonia, where enamelled bricks seem to have been used in extraordinary quantities.