The four arches are not of the same width, those on the east and west being wider than those on the north and south. In order to get the arches to spring from the same level and also to reach the same height at their heads, the wider arches are of the shape known as "depressed," while the narrower ones are of the "horse-shoe" type. The choir being somewhat narrower than the nave, the walls on each side take the place of the shaft which would have supported the outer order of the eastern arch. The capitals and bases of these arches are very plain, in fact nowhere in this church can the elaborately-carved capitals so often met with in late Norman work be found. This central tower was undoubtedly gradually raised stage by stage, as the character of the architecture indicates: probably during each interval the part already finished was capped by a pyramidal roof. [Illustration: THE TOWER ARCHES.] [Illustration: NORTH TRANSEPT AND CROSSING.] The #Nave Aisles# were widened in the fourteenth century, the Norman walls being removed and their roofs raised; a single stone of the weather moulding, which may be seen on the west face of the north transept, shows the height and slope of the roof of the Norman aisle. The windows of the aisles on either side are two-light Decorated windows; the three on either side to the east of the north and south porches are of the same character, while the two on each side to the west of the porches are also alike but differ in their tracery from those to the east. The south porch is much smaller than the north, and is very plain; it is composed of two solid walls projecting six feet from the wall of the aisle.