That part of the city which is walled in is nearly square, and divided by a partition-wall, running from east to west; the northern, much the largest part, is called the “old city;” the southern portion, more recently built, the “new city.” The circuit of the wall does not exceed six miles: its southern part, running east and west, is parallel with the river, from which it is removed about fifteen or twenty rods: on this side are the “_Foreign Factories_;” on the north, the city rests on the brow of the hill, and is at its highest point about two hundred and fifty feet above the surface of the river. The foundation and lower part of the wall, the arches and the gates, are formed of coarse sandstone; its remaining portion is built with soft brick. The walls are from twenty-five to forty feet high, and from twenty to twenty-five feet thick; the north side being the most substantial; on the east side the elements have made great havoc: a line of battlements with embrasures surmounts the walls, in the rear of which is a broad pathway. Two short walls, designed to block up the narrow space between the main wall and the ditches of the city, extend from its southeast and southwest corners; through each of these there is a gate. The city has sixteen gates, of which twelve are outer, and four open through the wall which separates the old from the new city; they are all guarded by soldiers, closed at an early hour in the evening, and opened at dawn of day. The streets and buildings in the suburbs are similar to those in the city, the houses of which occupy the whole space between the _wall and the river_ on its southern side; on its eastern quarter they are much less extensive; and in its northern division there are only a few solitary huts. The houses on the south are generally built against the wall which they overlook. The suburbs are scarcely less extensive and populous than the city, in which there are upward of six hundred streets, flagged with large stones, chiefly of granite; they vary in width from two to sixteen feet, the medium and most usual breadth being from six to eight.