The choir can still be traced, as the walls remain standing to the height of 9 feet, and contain an elegant sedilia and piscina. The choir measures, internally, about 124 feet in length by 22 feet in width. It may be questioned whether the choir was ever finished during the restoration. The walls present rather the appearance of having been abandoned at a certain stage in the progress of their erection than of a building which had fallen into ruin. They stand at a uniform level, marked by a string course all round, and have not the irregular heights generally found in ruins. The building is of fifteenth century work, and doubtless occupies the place of an earlier choir, which had been demolished. The wall at the east end of the nave, which separates it from the transept, is of a substantial kind, and may have been erected when the structure was restored in the fifteenth century, with the intention of rendering the nave a complete church, until the transept and choir were restored. The latter seems never to have been carried into effect, but to have been in progress when all work was interrupted by the Reformation. There are no indications at the junction of the choir and transept of the large piers which would naturally be built so as to correspond with those at the west side of the crossing (Fig. 954). The fine sedilia, although greatly mutilated (Fig. 955), is the principal feature in the eastern part of the edifice. It is 11 feet 2 inches long, and contains four seats, contrary to the usual practice, which is to have three seats. The design is elegant, and resembles that of the sedilia at St. Monan’s, Fifeshire. Adjoining the sedilia is the piscina, the basin of which is broken, but the aperture is still visible. The recess, which has an angled head, slopes backwards. [Illustration: FIG. 953.--Paisley Abbey. Plan.[12]] In this respect it resembles one at Auchterarder. On each side are two small recesses, about 12 inches wide, for holding the sacred vessels. The north transept (see Fig. 954) is in ruins, but the north wall, with the remains of a fine traceried window (Fig. 956), still exists, as well as a traceried window in the west wall. These traceries were restored a few years ago. The mode in which the turrets at the angles above the buttresses are corbelled out recalls similar features at Dunkeld Cathedral. These turrets resemble the roofed bartizans of castellated structures. [Illustration: FIG. 954.--Paisley Abbey. Junction of Nave with North Transept.] The south transept is also in ruins, and the tower and spire have disappeared. The Chapel of St. Mirin, however, is still well preserved, but the openings connecting it with the south transept have been built up.