hed 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.
It has been suggested that this was done in order to straighten the
north wall, which in the twelfth century had been built so that it
bent inwards towards the south.

The weathered and channelled backs of five of the buttresses are the
same date as those south of the nave; but the easternmost one has a
flat raking back like those to the north and south of the choir and
presbytery. The four western buttresses had pinnacles with
spirelets--now destroyed. The western one was square, the other three
octagonal. All these are earlier in date than the fifth one from the
west, this last one being probably the same in date, as it is in
detail, as those on the south side. The sixth one finishes plainly
with a square top. It may once have had a pinnacle, but none now
remains.

The parapet to the aisle chapels in the four western bays is plain,
with a weathered coping and string-course in which is some carved work
of late fourteenth-century date. The gables between the buttresses are
gone, as is the case on the south side; but traces of their old
copings remain. The four large three-light windows are the same in
design and detail, and were no doubt executed when the chapels
themselves we