From the above description it will be observed that in every case the principal part, the great mass, of the palace was the terrace on which it stood, which was raised by artificial means to a height of 30 ft. and more, and, as shown in the illustration (Woodcut No. 60), carefully revêted with stone. On this stood the palace, consisting principally of one great block of private apartments situated around an inner square court. From this central mass two or three suites of apartments projected as wings, so arranged as to be open to the air on three sides, and to give great variety to the outline of the palace as seen from below, and great play of light and shade in every aspect under which the building could be surveyed. So far also as we can judge, the whole arrangements were admirably adapted to the climate, and the ornaments not only elegant in themselves, but singularly expressive and appropriate to the situations in which they are found. Another most important discovery of M. Place is that of the great arched gates of the city. These were apparently always constructed in pairs—one for the use of foot-passengers, the other for wheeled carriages, as shown by the marks of wheels worn into the pavement in the one case, while it is perfectly smooth in the other. Those appropriated to carriages had plain jambs rising perpendicularly 12 or 15 ft. These supported a semicircular arch, 18 ft. in diameter, adorned on its face with an archivolt of great beauty, formed of blue enamelled bricks, with a pattern of figures and stars of a warm yellow colour, relieved upon it. [Illustration: 67. City Gateway at Khorsabad. (From M. Place.)] The gateways for foot-passengers were nearly of the same dimensions, about 14 or 15 ft. broad, but they were ornamented by winged bulls with human heads, between which stood giants strangling lions. In the example illustrated in the annexed woodcut (No. 67), the arch sprang directly from the backs of the bulls, and was ornamented by an archivolt similar to that over the carriage entrances, and which is perhaps as beautiful a mode of ornamenting an arch as is to be found anywhere. Other arches have been found in these Assyrian excavations, but none of such extent as these, and none which show more completely how well the Assyrians in the time of Sargon (721 B.C.) understood not only the construction of the arch, but also its use as a decorative architectural feature.[83] [Illustration: 68. Interior of a Yezidi House at Bukra, in the Sinjar.]