After the Decorated style {10a} was in some considerable degree established, the building appears to have proceeded, and the walls in the Choir raised; the Clerestory windows bearing evident marks, amidst the present barbarous tracery, of their having been originally of the early Decorated character, and of good execution. {10b} The upper part of the Eastern Window still retains what seems to be a portion of its original tracery. At this time also appears to have been inserted the _windows_ of the _North_ and _South Aisles_ of the _Choir_; and here again the work appears to have stood still, for the next succeeding works are considerably advanced in their execution. The next alteration we have to notice is a very considerable one and appears to have commenced in the reign of Edward III, and perhaps about the middle of it. It is very extensive, including the whole of the wall of the East Aisle of the South Transept, with the tracery of its windows, the whole of the piers of the South Transept, and of the Nave, with the arches resting on them, except the four great piers of the centre Tower. The walls, buttresses, and battlements of both Aisles of the South Transept, and the South Aisle of the Nave, if not completed, were so far finished, that the succeeding architect appears (from some obscure remains of pinnacles, &c., still in existence) not to have deviated from the original design. At this period a stoppage seems to have taken place, probably during the reign of Richard II., for all the subsequent work is Perpendicular; {11a} and the new architect seems to have found the tracery of the windows of the West Aisle of the South Transept, and the South Aisle of the Nave not prepared, although the architrave mouldings (which are shafts with beautiful Decorated capitals) were carried up to the springing of the arch, and the arch mouldings completed, except the mullion itself, the courses of which are different from those of the arch mouldings. It also appears probable that no design had been made for the great South Window, as the wall was carried up very little above its commencement. The workmanship of the Decorated architect is peculiarly excellent. The tracery of those windows which he completed is uncommonly rich in design, and delicate in execution, notwithstanding the poor texture of the stone, which has rendered it impossible to make out the mouldings of some of the tablets. Enough remains, in parts a little defended from the weather, to show the excellence of the exterior workmanship; and the capitals of the interior piers are of design, which, if they were cleared of their numerous coats of whitewash, would be equal to many in York Minster.