From the chapter house a passage is visible in the upper part of the east wall of the north transept. In order to admit of this, the wall of the transept (as above pointed out) has required to be made of great thickness, and this explains the depth of the two recesses under it in the transept previously referred to. As already mentioned, there was an upper floor over the chapter house and the adjoining portions of the east range of the cloister buildings. Part of this upper floor is believed to have been the library--the literary treasures of which were famous--and part would, no doubt, be the dormitory of the monks. It seems not improbable that the passage in the transept wall may have led from the library or dormitory to the chapel in the upper aisle of the choir over the sacristy, and the use of that chapel would thus be explained. The chapel, as already mentioned, is a structure of late erection, as is apparent from the imitation dog-tooth running round the straight-sided arch of the east window (see Fig. 1002). The passage in the transept wall may be much older, but was possibly utilised in connection with the late reconstruction of the monastery, as above suggested. To the north of the chapter house are two chambers of good size, over which an upper story has extended, as the remains of the windows show. The north side of the cloister has been occupied by the refectory, a building 63 feet long by 20 feet wide. It is situated on the first or upper floor, and is of late work; but seems to occupy the position of a previous refectory, which formerly stood on the site, and of which some portions of the walls remain. The first refectory appears to have been on the ground floor, as the remains of what must have been a handsome doorway in the south wall near the west end of this range prove. This doorway has had three orders of mouldings with shafts and caps, about 7 feet high, apparently of thirteenth century work, of which some fragments remain, partly built into the adjoining angle structure. The latter is evidently a late erection, as it encloses part of the west jamb of the above doorway. The pier of the diagonal arch of the cloister walk at the east end of the refectory also encroaches on the door beside it. At a somewhat late period the refectory has been raised to the upper floor, and an entrance made to it by a wide staircase at the east end (which would also probably form the day staircase to the dormitory). The ground floor is low, and has loopholes for windows. It has apparently been used for cellars or storages. There is a wide pointed doorway leading into it at the north-west angle (see Fig. 997). The north elevation of the structure is fairly preserved. The buttresses seem to be reconstructions on the lines of the original ones, but the windows, both in the north elevation and towards the cloister, are of later date.