It has been supposed by some that a chapter-house once existed within the paradise close by the west angle of the transept. The south end of the transept rises on the north side of the cloister garth. At the south-west angle a great part of the twelfth-century masonry in the broad flat buttresses remains. The south-east angle and buttresses are quite different. They are perhaps part of the work done during the thirteenth century, though it is possible that they were introduced when Langton inserted the large south window of the transept. This window has been very much restored since the seventeenth century, when it was almost knocked in pieces. Wooden props served instead of mullions for many years to hold up the tracery above. The repair that has been effected retains the old design. Above each angle of the transept is a turret, octagonal in form. Neither of them is complete. They were only required in the fifteenth century as a means of access to the roofs at the parapet level from the staircases in the angle buttresses. The gable of the transept rises above the parapet just described, but it is not in the same vertical plane as the face of the wall below. The top of this gable was for many years in a very wrecked condition. The design of the tracery in the rose window is in two orders, based upon equilateral triangles filled in with cusps. Close to the ground on the south-west corner buttress are two string-courses. The lower of these is a billet-moulded course cut, like those to be seen on the south-west tower. Its presence here, and at this level, shows that this was the original level of the sills of all the old Norman windows on the outside walls until about the close of the twelfth century. On the east side of this part of the transept, at the clerestory level, are two round-headed windows. Both originally were all of twelfth-century workmanship. But now the southern one has abaci, capitals, angle-shafts, and base, which are thirteenth-century work, and the early label-mould has been changed. The other window shows partly what was once probably the character of both of them. But the greater part of this window was restored when the central tower and spire were rebuilt after 1861. Between the windows is a buttress that was introduced when the vault was added. The south-east angle on this side retains part of the twelfth-century flat buttressing. There are on this wall and the turret different types of masonry, which represent five distinct periods of building, from the twelfth to the nineteenth century. But the junction between the work of two of these periods, being a weak part, shows by the crack down the wall from the parapet that some movement has taken place here.