The eastern piers of the crossing were demolished probably in Henry VIII.'s time, and their destruction entailed that of the central tower, of which the western wall only remains. The transepts have suffered by the fall of the tower, but fortunately the south wall of the transept with its finely decorated window is still preserved. From the south transept access is obtained to the roof of the nave aisle and to the uppermost parts of the structure by a turnpike stair, which also forms the only mode of approach to the tower.[458] "The choir, so far as the east is concerned, is well preserved, the buttresses and gable, the celebrated eastern window, and the remarkable vaulting of the presbytery being all in good order. The remainder of the choir, however, has been greatly wrecked by the fall of the central tower; but many of the windows of the choir and transept with their perpendicular tracery have escaped destruction, and afford the best example in Scotland of that form of design."[459] The building, as it now stands, is, generally speaking,[460] of a date subsequent to Bruce's time, and much of it is later than the destruction which occurred under Richard II. in 1385.[461] "The nave, from the crossing to the rood loft, and part of the transepts are, undoubtedly, the oldest portions of the existing edifice. The work in these is, for the most part, of the Scottish decorated period. The nave piers, with their beautifully carved caps, and the mouldings of the arches are distinctly decorated work; and the flying buttresses and pinnacles on the south side of the nave are, without doubt, of the same period. So also is the south wall of the transept, with its magnificent window and tracery and its buttresses, enriched with fine canopies and quaint figures carved as corbels.