His successor, William de Trumpington, was more economical, and produced more work. He completed the porches, and built in the western end of the nave four bays on the north and five bays on the south side. It can still be seen how he economised, not only on John de Celia’s design, in the arch that was to have led into a south-western tower, but on the design of his own bases, piers and vaulting-shafts; he even renounced the idea of vaulting his work at all—a very ungothic procedure. IV. GEOMETRICAL.—His successors went further still; they abandoned all hope of rebuilding the rest of the nave, and turned their attention to the eastern limb. Retaining their stalls, as at present, in the crossing and the three western bays of the nave, they were able to go on with works to the east without any interruption to the services. The works dragged on very slowly. For some reason or other this wealthy abbey—with estates in almost every county of England—never had money to spend on its church. [Illustration: THE REREDOS.] First, the Norman sanctuary and apses were demolished, except that a length of Norman wall was retained on either side of the sanctuary. If this had been removed the tower might have collapsed. The chief feature of the new sanctuary is the clerestory windows, with tracery of early type, _c._ 1250. Soon after, the lower parts of the Saint’s chapel and the ante-chapel were built; these were not completely finished till _c._ 1315. There, too, “vaulting ambition had o’erleapt itself”: the monks made preparations for vaults both within and without the ante-chapel, but in the end put up an unworthy flat ceiling. About 1295 they commenced a new Lady chapel. This was not finished till about 1326. Thus it was built in the last years of the Geometrical and the early years of the Curvilinear style, and, like Selby choir, illustrates charmingly the transition from the one to the other. V. CURVILINEAR.—The monks had now done all they meant to do. The eastern limb was rebuilt. They meant to do no more in the nave. But their hands were forced. Five Norman bays collapsed on the south side of the nave in 1323, and the monks had perforce to rebuild them. The design is closely assimilated to that of the Lancet bays to the west; the clerestory actually having lancet windows without tracery. To this period belong the shrines of St. Alban and St. Amphibalus, the Rood-screen, the doorway and arcade of the cloister. [Illustration: THE SHRINE.] VI. PERPENDICULAR.—The great gateway was built _c._ 1380. The nave and choir were better lighted on the north side by the insertion of windows in the triforium. The watching-loft was constructed _c._ 1420; the choir was ceiled, and the great reredos was erected _c._ 1480. To the same period belong the brass of Abbot de la Mare, _c._ 1390; and the grand chantries of Abbot Wheathampstead and Duke Humphrey of Gloucester, _c._ 1440. VII. TUDOR.—The grandest chantry of all is that of Abbot Ramryge, _c._ 1520.