those in the priest-vicars' vestry and in the chamber above the
present library. It seems to be an example of that later work of the
twelfth century of which other specimens no doubt remained in the
walls of the lady-chapel before Bishop Gilbert transformed it into its
present state. Close to this window, and rising up just above the sill
of the clerestory windows, is a narrow, flat buttress, which is
probably of the same date as the window. Its upper half has an
attached shaft on each angle, with moulded bases and carved capitals
of the same period; but the weathering on its top appears to have been
changed in the thirteenth century.

Close by is the only part now remaining of the twelfth-century outer
wall of the nave aisle. The original corbel course of the parapet
remains, but not the upper part of the parapet. And it may be seen
here that the small windows that lighted the triforium gallery had
round arched heads in two orders, with a string-course at their sill.
Below this string is a thirteenth-century pointed window, with a
billet-moulded label cut in a twelfth-century manner of design.

[Illustration: THE CATHEDRAL FROM THE NORTH-EAST. _Photochrom Co.,
Ltd., photo_.]

The north side of the nave retains the seven twelfth-century
clerestory windows, the one next to the transept having been rebuilt
after the fall of the central tower and spire in 1861. There are no
remains of later insertions, as on the south side. The parapet is
later in design than those to the choir and lady-chapel; but it is of
the same date as that on the south wall of the nave. In the five
eastern bays it is of two tiers. The upper projects beyond the lower,
and so widens the span between the north and south clerestory walls.