The nave is the only part of the main divisions of the church which survives as a whole. It measures, internally, 92 feet in length by 60 feet in width, and contains six bays, divided by massive piers, all surmounted by a triforium and clerestory. There is a porch on the north side and two doorways from the cloister on the south side. The oldest portion of the building is, undoubtedly, the eastern part of the south wall of the south aisle of the nave, where it adjoins the transept. This portion of wall consists of three bays (Fig. 957), containing the south-east doorway from the cloister to the nave, and three pointed windows in the upper part. The doorway is of the transition style, having a round arch-head, with numerous bold mouldings springing from carved and foliaged [Illustration: FIG. 955.--Paisley Abbey. Sedilia in Choir.] caps with square abaci (Fig. 958). The windows above are very simple in style, and are apparently early first pointed work. This part of the building probably dates from the first half of the thirteenth century. The western portion of the south aisle of the nave (Fig. 959) and the whole of the south clerestory (see Figs. 957 and 959) are evidently portions of the restored church of the fifteenth century. The south aisle wall contains the south-west and south-east doors from the nave to the cloister. The windows of the south wall have the sills placed at a high level, so as to admit of the roof of the cloister walk being placed against it. The corbels which supported the roof still exist, and are shown in the sketches. [Illustration: FIG. 956.--Paisley Abbey. Windows in North Transept.] [Illustration: FIG. 957.--Paisley Abbey. East Part of South Side of Nave.] The west end of the nave (Fig. 960) is also in part amongst the ancient portions of the structure. The western entrance doorway is clearly, from the style of its architecture, a work of the thirteenth century. The doorpiece [Illustration: FIG. 958.--Paisley Abbey. South-East Doorway in Cloister. A. Door Jamb. B. Arch Moulding. ] projects, and has a nook shaft on the projecting angles. The doorway is a single pointed opening, deeply recessed, with a series of free shafts in the jambs, having rounded and moulded caps, and the arch mouldings are arranged in square orders. The outer order contains a dog-tooth ornament. A sharply pointed arch flanks the doorway on each side, and has similar shafts and mouldings to those of the central opening. The aisle windows of the west front also belong to the first pointed period. The thin nook shafts, with moulded caps having round abaci and central bands, are all in the style of the thirteenth century.