We will now conclude our account of the front in its present form, with a description of its flanking towers. The northern is square for its whole height, and has four rows, one above the other, of blind arcading. The southern, with the same number of arcades, is also square in its lower portion, but, for the two upper rows becomes octagonal, and finally terminates in an octagonal pyramid. The spire of its fellow on the north can scarcely be called octagonal; it is square, with the angles only slightly cut down, and with slight splaying at its base. On the summits of both are curious conical caps (like those described as surmounting the gable turrets), from which ribs run down the angles. The arcades are continued round the outer sides of the lower parts of the towers, and right round when the roofs of the aisles are passed. The heads of all the arches are as usual semicircular, and the second arcade from the top is filled with a diaper of semicircles arranged in a curious scale-like pattern. Generally, as we have said, except for the great Perpendicular window and the gable above it, the front shows the design of the later Norman builders. The window that they constructed in it was possibly wheel-shaped, but we have no representation of the cathedral previous to its supplanting. The parts of the front that show their old form now have not, however, all continuously retained it. At the time of the erection of the Perpendicular clerestory to the nave, the northern gable turret was rebuilt in the curiously plain, octagonal, flat-topped form, which the oldest engravings of the front illustrate. It has only quite recently been altered again to the earlier shape of its fellow on the south; and is the only feature in which there is any conspicuous difference between the front as now seen and as shown in our early eighteenth century view. An earlier, seventeenth-century view exists, in which, if it were not so inaccurate, the front would have the same appearance. In this, however, as in his north prospect, Daniel King shows his great liability to err. We can point to the insertion of one tier of arcading too many in the central portion of the front, and to the omission of the windows at the ends of the aisles, as well as of the small door.