The whole of the eastern arm of the cathedral is curiously mixed in style, furnishing examples of Early English, Decorated, and Perpendicular architecture. Beyond the main east gable just described projects a low Early English structure of three nearly equally high aisles, of which the central or Lady Chapel has received a further Perpendicular addition. There has been apparently a slight subsidence of the Early English walls, which has caused the irregular look of the arches in the interior of the southern retro-choir aisle (see page 69). Above the plain string-course of the retro-choir there is in each compartment, under a level parapet, an arcade of narrow pointed arches, four in number, the central couple of each set being pierced and glazed, so as to form pairs of lancet windows. The Langton and Guardian Angels' chapels, which project not quite half as far as the Lady Chapel from the old eastern limit of the church, show a triple series of arcades, diminishing in size as they mount. The central arcade is much cut into on the eastern face by the large three-light windows of the lateral chapels. There is no parapet above the arcades. At the angles between these chapels and the retro-choir aisles are staircases enclosed in small octagonal turrets rising slightly above the adjoining parts with merely a plain parapet at the top. The #Lady Chapel# has at the end and at each side a fine seven-light Perpendicular window, the heads of the lights below the transom being cinquefoiled, while above each window is a cornice supported by small arches resting on corbels; over all is a pierced battlement, which is also crenelated at the actual east end. Below the east window of the Lady Chapel, between the two great buttresses with mutilated canopies on the two lower of their three divisions, there is some blank panelling, consisting of four shallow-arched recesses with a pilaster down the centre, each arch uniting two minor ones with cinquefoil cusps at the head and crowned by a quatrefoil with a rosette in the middle. There were originally four heads at the ends of the corbels under these quatrefoils, but the southernmost is broken away. A similar arcade runs along the southern wall of the Lady Chapel, but there is none on the north side. The two main corbel-tables at the east end show the arms of England and France and the bishop's device of three "torteaux." Under these, at a short distance from the ground, are two smaller windows, which give light to the Lady Chapel crypt. The panelling dates from about 1490, and is due to Bishop Peter Courtenay. [Illustration: NAVE, SHOWING THE SCREEN BEFORE RESTORATION. _A. Pumphrey, Photo._] CHAPTER III THE INTERIOR