Next we see above the =tower arch= the mark of the old nave roof and the old north wall of the nave. These show that the south wall stood where the present one does, and the low-pitched fourteenth century roof-line suggests incidentally this alternative: _either_ a clearstory had been added to the nave before the building of the new chancel or tower was in contemplation, _or_, when the huge tower was built it was felt necessary to raise the nave roof so as to lessen the disproportion. But, if we adopt the latter alternative we must accept too the improbability that this expense should have been incurred when the inadequacy of the old narrow nave of 15½ feet compared with a chancel of 33 feet must have been so obvious. This is one of the difficult questions. Then it is held by some that the axis of the old nave and chancel was in line with that of the present choir; but the south porch, built more than one hundred years before the new nave, is at right angles with it which would hardly have been the case had the two naves not been on the same lines. Needless to say the old east end could scarcely have extended beyond the present nave, so that the new chancel was probably built without disturbing the old church. The position of the older Lady Chapel supports this view, while its bearing towards the north, as already pointed out, indicates that the deflection of the new chancel is simply copied from the older one. The position of the south porch proves also that the south aisle was as wide as the present one, while the fact that it was wider than the nave shows that it was almost certainly not designed at the same time. The nave is of six bays and is 54 feet high at the centre, while each arch is 20 feet wide in the clear. The piers are slender, but, owing to the depth of the panelling above the arches and the large size of the windows, the weight upon them is reduced to a minimum. Shafts carried up from the ground support the roof brackets, and there are intermediate ones over the centre of each arch. The clearstory windows of four lights each are in pairs, and the mullions are carried down to form panelling and finish on the backs of the arches, which recede in two sloping faces and form a somewhat unusual feature in the treatment of the wall surface. The detail of the piers and arches is rather weak, even for Perpendicular work. [Illustration: INTERIOR FROM THE SOUTH DOOR.]