It is only within a comparatively recent period that we have had any knowledge of the architecture of these countries; but the explorations of M. Botta, commenced in 1843 and continued by M. Place, and those of Mr. (now Sir A. H.) Layard in 1845, combined with the successful attempts of Prof. Grotefend, Prof. Lassen, and Col. Rawlinson at deciphering the cuneiform inscriptions, have disclosed a new world to the architectural student, without which some of the developments of Greek architecture must have remained obscure. The authentic remains of buildings of the early Chaldæan period are too few and in too ruinous a condition to allow of a reproduction of their architectural features with any certainty. The buildings, whether palaces or temples, appear to have been constructed on terraces, and to have been several storeys in height; and in one instance, at Mugheyr, the walls sloped inwards in a similar manner to those of Egyptian buildings, a peculiarity which is not met with in other examples of West Asiatic architecture. The materials employed were bricks, both sun-dried and kiln-burnt, which seem to have been coated with a vitreous enamel for purposes of interior decoration. Fragments of carved limestone were discovered by Sir A. H. Layard, but the fact that the fragments found have been so few ought not to lead us too hastily to the conclusion that stone was not used as facing for architectural purposes, as after the buildings became ruined the stone would eagerly be sought for and carried away before the brickwork was touched. Bitumen seems to have been employed as a cement. Although original buildings of this era cannot be found, it has been shown that in all probability we have, in a building of a later date--the Birs-i-Nimrud--a type of the old Babylonian temple. This in its general disposition must have resembled that of the Tomb of Cyrus, described and figured later on, though on a vastly larger scale. The lowest storey appears to have been an exact square of 272 ft.; each of the higher storeys was 42 ft. less horizontally than the one below it, and was placed 30 ft. back from the front of the storey below it, but equidistant from the two sides, where the platforms were 21 ft. wide. The three upper storeys were 45 ft. in height altogether, the two below these were 26 ft. each, and the height of the lowest is uncertain. The topmost storey probably had a tower on it which enclosed the shrine of the temple. This edifice was for a long time a bone of contention among savants, but Colonel Rawlinson's investigations have brought to light the fact that it was a temple dedicated to the seven heavenly spheres, viz. Saturn, Jupiter, Mars, the Sun, Venus, Mercury, and the Moon, in the order given, starting from the bottom. Access to the various platforms was obtained by stairs, and the whole building was surrounded by a walled enclosure. From remains found at Wurkha we may gather that the walls