Peking has, during its history, existed under many different names; after each disaster her walls have been changed and her houses rebuilt, so that to-day she stands, like the capitals of the ancient Roman and Byzantine empires, upon the débris of centuries of buildings. The most important renovations have been those by the Liao dynasty, in 937 A.D., who entirely rebuilt the city, and by the Kin rulers in 1151. It was at first surrounded by a single wall pierced by nine gates, whence it is sometimes called the City of Nine Gates. The southern suburbs were inclosed by Kiatsing in 1543, and the city now consists of two portions, the northern or inner city (_Nui ching_), containing about fifteen square miles, where are the palace, government buildings, and barracks for troops; and the southern or Outer city (_Wai ching_), where the Chinese live. The wall of the Manchu city averages fifty feet high, forty wide at top, and about sixty at bottom, most of the slope being on the inner face. That around the Outer city is no more than thirty in height, twenty-five thick at bottom, and about fifteen at top. The terre-plein throughout is paved with bricks weighing sixty pounds each; a crenellated parapet runs around the entire town, intended only for archers or musketeers, as no port-holes for cannon exist. It is undoubtedly the finest wall surrounding any city now extant. Near the gates, of which there are sixteen in all, the walls are faced with stone, but in other places with these large bricks, laid in a concrete of lime and clay, which in process of time becomes almost as durable as stone. The intermediate space between facings is filled up with the earth taken from the ditch which surrounds the city. Square buttresses occur at intervals of sixty yards on the outer face, each projecting fifty feet, and every sixth one being twice the size of the others; their tops furnish room for the troops posted there to resist side attacks. Each gate is surmounted with a brick tower of many stories, over a hundred feet high, built in galleries with port-holes, and giving a very imposing appearance to the city as one approaches it from the wide plain. The gates of the Manchu city have a double entrance formed by joining their supporting bastions with a circular wall in which are side entrances, thus making an enceinte of several acres, in which the yellow-tiled temple to the tutelary God of War is conspicuous. The arches of all the gates are built solidly of granite; the massive doors are closed and barred every night soon after dark. ~GENERAL ASPECT OF THE CAPITAL.~