A narrow passage from the Plaza de San Martin leads to the upper side of a third Plaza opposite the east end; and here, though the cathedral has been enclosed within square modern walls, there is fortunately just enough left of the exterior of the eastern chapel and part of the apse enclosed in a small court to explain its whole original design. The entrance to this court is garnished with a number of statues, evidently, I think, taken from a doorway, and perhaps from the destroyed north doorway.[160] From this fragment of the chevet, it seems that the eastern chapel was surrounded with a deeply recessed arcading, within which were broad, round-arched windows with moulded archivolts carried on shafts with sculptured capitals. The smaller chapels have three-quarter shafts running up to the cornices placed between the windows, and the corbel-tables at the eaves are simple and bold. The bay between the chapels has a window occupying the whole space in width, and above it is a small circular window, a feature which occurs in almost exactly the same position in S. Sernin, Toulouse.[161] A string-course is carried round the aisle wall above the roofs of the chapels, and the wall is continued up to the same level as the walls of the aisles of the church, and has alternately windows and arcading in its outer elevation. This is perhaps the only serious difference between the design of this church and that of S. Sernin. There the triforia are not carried round the chevet, and consequently the aisle walls are not so lofty, and the clerestory of the apse is shown in the usual way. Continuing the circuit of the cathedral, we now reach the Plaza de los Plateros, in front of the south transept. This is bounded on the west side by the outer walls of the cloisters, and a broad flight of steps all across the Plaza leads up to the transept. This has been to some extent damaged by the erection of a lofty clock-tower projecting at its south-east angle, in which are the clock and the bells. The rest of the old façade is fortunately preserved. It has two doorways in the centre division, and two grand and deeply recessed windows above them. The ends of the aisles seem to have been similarly treated above. The finish of the transept wall is modern, but there still remain two canopies in it, under one of which is a figure of the Blessed Virgin, no doubt part of a sculpture of the Annunciation.