14. It has been asked: how were those halls roofed and how were they lighted? questions which have given rise to much discussion and which can scarcely ever be answered in a positive way, since in no single instance has the upper part of the walls or any part whatever of the roofing been preserved. Still, the peculiar shape and dimensions of the principal palace halls goes far towards establishing a sort of circumstantial evidence in the case. They are invariably long and narrow, the proportions in some being so striking as to have made them more like corridors than apartments--a feature, by the by, which must have greatly impaired their architectural beauty: they were three or four times as long as they were wide, and even more. The great hall of the palace of Asshur-nazir-pal on the platform of the Nimrud mound (excavated by Layard, who calls it, from its position, "the North-West palace") is 160 feet long by not quite 40 wide. Of the five halls in the Khorsabad palace the largest measures 116 ft. by 33, the smallest 87 by 25, while the most imposing in size of all yet laid open, the great hall of Sennacherib at Koyunjik, shows a length of fully 180 ft. with a width of 40. It is scarcely probable that the old builders, who in other points have shown so much artistic taste, should have selected this uniform and unsatisfactory shape for their state apartments, unless they were forcibly held to it by some insuperable imperfection in the means at their disposal. That they knew how to use proportions more pleasing in their general effect, we see from the inner open courts, of which there were several in every palace, and which, in shape and dimensions are very much like those in our own castles and palaces,--nearly square, (about 180 ft. or 120 ft. each way) or slightly oblong: 93 ft. by 84, 124 ft. by 90, 150 ft. by 125. Only two courts have been found to lean towards the long-and-narrow shape, one being 250 ft. by 150, and the other 220 by 100. But even this is very different from those passage-like galleries. The only thing which entirely explains this awkward feature of all the royal halls, is the difficulty of providing them with a roof. It is impossible to make a flat roof of nothing but bricks, and although the Assyrians knew how to construct arches, they used them only for very narrow vaults or over gateways and doors, and could not have carried out the principle on any very extensive scale. The only obvious expedient consisted in simply spanning the width of the hall with wooden beams or rafters. Now no tree, not even the lofty cedar of Lebanon or the tall cypress of the East, will give a rafter, of equal thickness from end to end, more than 40 ft. in length, few even that. There was no getting over or around this necessity, and so the matter was settled for the artists quite aside from their own wishes. This also explains the great value which was attached by all the Assyrian conquerors to fine timber.