We need not here go further into details upon this point. In these general and introductory remarks we have endeavoured to point out as concisely as possible how the salient characteristics of Assyrian architecture are to be explained by the configuration of the country, by the nature of the materials at hand, and by the climate with which the architect had to reckon. It was to these conditions that the originality of the system was due; that the solids were so greatly in excess over the voids, and the lateral over the vertical measurements of a building. In this latter respect the buildings of Mesopotamia leave those of all other countries, even of Egypt, far behind. They were carried, too, to an extraordinary height without any effort to give the upper part greater lightness than the substructure; both were equally solid and massive. Finally, the nature of the elements of which Mesopotamian architects could dispose was such that the desire for elegance and beauty had to be satisfied by a superficial system of decoration, by paint and carved slabs laid on to the surface of the walls. Beauty unadorned was beyond their reach, and their works may be compared to women whose attractions lie in the richness of their dress and the multitude of their jewels. NOTES: [147] OPPERT (_Expedition scientifique_, vol. i. p. 86) gives a description of one of these storms that he encountered in the neighbourhood of Bagdad on the 26th of May. [148] LAYARD, _Nineveh and its Remains_, vol. ii. p. 119. When one of these mounds is attacked from the top, the excavators must work downwards until they come to this paved platform. As soon as it is reached no greater depth need be attempted; all attention is then given to driving lateral trenches in every direction. In Assyria the mass of crude bricks sometimes rests upon a core of rock which has been utilized to save time and labour (LAYARD, _Discoveries_, &c., p. 219). [149] See HERODOTUS, i. 181-184; and DIODORUS, ii. 9. [150] By such means M. OPPERT arrives at a height of 250 Babylonian feet, or about 262 feet English for the monument now represented by the mound in the neighbourhood of Babylon known as Birs-Nimroud. _Expedition scientifique de Mesopotamie_, vol. i. pp. 205-209, and plate 8. [151] Homologeitai d' hupselon gegenesthai kath' huperbolen.--DIODORUS, ii. 9, 4. [152] The mound called Babil on the site of Babylon (Plate I. and Fig. 37) is now about 135 feet high, but the Birs-Nimroud, the highest of these ruins, has still an elevation of not less than 220 feet (LAYARD, _Discoveries_, p. 495).