As has been said, the proportions of the bays in the transepts are very different to those of the nave. The triforium is much larger, and the clerestory much smaller. The main arches, slightly smaller in proportion than those of the nave, are extraordinarily rich and beautiful in detail. Their mouldings are very complex and deep, and are varied with dog-tooth and billet ornament. The piers are perhaps too thin, though beautiful enough in themselves. They are made up of alternate shafts of Purbeck marble and stone. Those of Purbeck are ringed half-way up. The Decorated piers are altogether of stone, and not ringed at all. The arrangement of the shafts is not quite so bold and various as in some other Early English work--the choirs of Ely and Worcester, for example. The capitals are finely carved, though small. Those in the north transept are rather richer than those in the south. [Illustration: South Transept, Triforium, and Clerestory.] The corbels of the vaulting shafts, which are placed just above the capitals of the piers, are very large and richly decorated with four rows of foliage. They support three shafts each, one large and two very slender, as in the nave. On each side of the larger shaft is a dog-tooth moulding. The main arches, especially on the east side of the south transept, are considerably out of plumb, owing to the great weight of the lantern, and perhaps to the inferior material used in the transepts. The triforium consists of a single great circular arch in each bay. It is divided by a thick central cluster of shafts into two smaller arches, and these in turn are divided by slenderer piers into two smaller arches still. In the head of the largest arch is a cinquefoil opening ornamented with cusps and dog-tooth moulding. In the heads of the smaller arches are quatrefoil openings decorated in the same way. The mouldings of the large arches are very bold, and ornamented with dog-tooth; those of the lesser arches are less bold and plainer. The shafts of the triforium run down on to a gabled sill which cuts into their bases. There is the same arrangement in the choir. The clerestory consists of an arcade of five divisions, the three middle being windows, the outer ones blind. The clusters of shafts dividing them are very rich and thick. The mouldings of the arches are broad and deep, the dog-tooth ornament being profusely used. Above the arches is a cornice decorated with foliage. The vaulting shafts terminate in the wooden ribs of the roof, without the division of a capital, about two feet above the string course. The aisles are vaulted, as in the rest of the minster, with stone. The shafts supporting the vault are very richly clustered and varied. The mouldings also are broad and deep; in fact, some of the finest work in the whole of the minster is to be found in these aisles. Below the aisle windows runs an arcade with trefoiled arches, which is very plain and simple in its details.