The design of the west wall of the north transept is different from that of the other parts of the building, but the clerestory windows are of the same design as the rest of the older church. "The wall ribs of the vaulting include two windows in each; and the space between the windows is occupied by two niches, each carried up from a shaft--with late canopies, containing statues of St. Peter and St. Paul, the former having the keys and the latter holding his sword. These are the best preserved statues in the church, but they are not of very remarkable workmanship."[466] The building or restoration of the eastern part of the edifice is regarded as indicating, from its style, work of the middle of the fifteenth century, and the vaulting of the south transept appears to have been erected by Abbot Hunter about the same time,[467] probably from 1450 to 1460. More of the vaulting in the eastern part of the nave may have been carried out at that epoch. The vaults all contain, besides the main and ridge ribs, subsidiary ribs, or tiercerons, indicating a similarity to English examples.[468] The vaulting of the presbytery is peculiar, and points to a somewhat later time; examples of vaulting similar to that of the presbytery of Melrose may be seen at Winchester Cathedral, and other English examples of the fifteenth century.[469] The south chapels to the west of the fifth buttress west from the transept, on which buttress another specimen of Abbot Hunter's arms is engraved, are of comparatively late date.[470] "This buttress belongs to the earlier part of the nave, and the chapel seems to have been repaired when the additional chapels to the west were erected. Besides the three hunting horns in the shield of Abbot Hunter in the examples above mentioned, the arms engraved on the fifth buttress contain two crosiers, saltierwise, and the initials A. H. on the right and left; also, in chief a rose, and in base a mason's mell for Melrose. The work in the chapels to the west is inferior to that of those to the eastward, although copied from them. The chapels each contain an enriched piscina, and these are so inferior in style of workmanship as to lead to the belief that they were inserted after the chapels were built. One of them contains the initials of Abbot William Turnbull, whose date is the beginning of the sixteenth century. A late piscina has also been inserted in the south transept.