the serious
settlement which necessitated the huge Perpendicular buttress at the
corner of what is now the vestry. There is, it is true, some difficulty
in the fact that it is not the vestry but the Chapter-house which is
mentioned, and in the allusion to a dilapidated roof (_tectura_); but it
is conceivable that there was as yet no dividing wall, that the vaulting
of what is now the vestry was still standing, that it had been injured
by the settlement above-mentioned--in fact that its removal and the
erection of the dividing wall took place in the time of Archbishop Lee.
His direction for repairs may also account for the presence of limestone
in the north wall of the Chapter-house, and for the propping of the
vault at the west end of the crypt.[116] As has already been shown, the
history of the vestry is bound up with that of the Chapter-house. At
what period services ceased to be held at the altar in the apse, it is
difficult to say; perhaps on the completion of a Lady Chapel above,
perhaps on the erection of the dividing wall,[117] perhaps through the
advent of the Reformation. At any rate, it was probably not before this
part of the church had ceased to be used for services that it began to
be recognised as a robing-room. There is an allusion to a recognised
vestry in Leland, and very possibly the present room is meant; if so, it
would seem from his account to have been used also as a library. But the
fact remains that the church possesses no vestry except what is
obviously a disused chapel.

=The Lady-chapel= or Lady-loft is 23 feet 3 inches wide, and 68 feet
long.[118] Its west and north sides, being formed by what was once the
exterior of the church, display not only windows and buttresses, but
also a string-course with gargoyles. From the west wall projects one of
Archbishop Roger's buttresses, terminating in a slope, between the two
blocked windows of the Mallory Chapel, which resemble the aisle windows
of the other transept. The window on the right, mutilated by the
insertion of the doorway, has lost its shafts, and retains only their
capitals. The other window is partly cut off by the south wall, and is
now a cupboard.

In the north wall, the first three bays are Archbishop Roger's, and the
windows resemble in their treatment the two just described, and are
separated from each other by two buttresses which terminate, like those
on the opposite side of the choir, in two slopes one close below the
other. The