At the south-east angle stands the great tower or keep (to the left in the view), commanding the canal and the “place,” and overtopping the tower of the Count, which stood opposite to it. This tower was built by Archbishop Gilles Ascelin in 1318, and forms an independent redoubt. It is four storys in height. The basement is circular internally, and, as usual, has no openings to the exterior, being only reached from the floor above by an aperture in the vault. The first floor is octagonal internally and vaulted. It is intended for defence, and is provided with passages in the thickness of the walls, from which diverging loopholes command the exterior in all directions. The third floor is square internally, and has been the living room, being furnished with windows on three sides and a fireplace, and had a wooden ceiling. The top story is also square, and is covered with a pointed vault. It has three windows, and chambers in the wall provided with loops for defence. The construction of the roof and angle turrets is somewhat remarkable. The central platform of the roof is some feet lower than the parapet walk, and is connected with it by a series of steps rising along each side. The angle turrets are three storys in height, and access is obtained to the different stages, 1st, from the platform roof; 2nd, from the parapet walk; and 3rd, by steps up from the latter to the parapet on the top of the turrets. The tower was fortified on its three angles next the outside, with the above formidable turrets, which were probably further armed with some kind of wooden machicolations in time of danger. The fourth angle, next the inner courtyard, contained the staircase with a watch turret carried up above it. The other portions of the palace comprised an immense hall, and the numerous living apartments of the archbishop and his retainers. The entrance was by a long open passage well defended from high walls on either side. Within the fortified enclosure were also the cloisters and chapter house. These are of a somewhat late and cold design, dating from 1375. The roof, which is flat, formed an agreeable promenade within the walls. The Church of St Paul, beyond the canal, is an example of the mixture of the Gothic and Southern styles. The piers are light and lofty, and exhibit a Gothic character mixed with souvenirs of the heavier preceding style, in the small and few windows, the “historied” caps, &c. On the way between Narbonne and Perpignan ample opportunity is afforded, as the railway runs along between the lengthy lagunes and through the dreary salt marshes, of observing the process of silting up which has here been in progress for centuries, and which has had such a marked influence in changing the character of the country, and in affecting the fortunes of the various cities which formerly flourished on the prosperous banks of these inland seas, now so desolate and pestiferous.