XI. The great _east window_, which terminates the choir, is the largest in England, and is, owing to the ingenious construction of this part of the choir, wider than the side walls which contain it: it is filled with what is, in many respects, the finest stained glass of the period in this country. The window itself, in its general design and tracery, corresponds with the panelling of the choir and with the windows of the clerestory, and is part of Abbot Horton’s work. The tracery-heads and cusps on the inside do not appear without, as usual, since the glass (probably to save expense) is fitted into a square-headed panel, sunk in the back of the window. A peculiar effect is produced by the roof of the Lady-chapel beyond, which rises against the lower part of the window, (from which it is separated by the ante-chapel); the glass above is consequently always in brighter light than that below. The stone-work of the whole window has been repaired (1862) at a cost of £1,400; and £600 has been expended on the re-leading of the glass by HUGHES[18], under the very careful supervision of Mr. Winston, one of the best authorities on the subject. The window, like the rest of the choir-work, has decided Perpendicular features; but the glass “is in all respects thoroughly Decorated in character;... As a general rule, it is true that a change in the style of architecture has always preceded, by some years, the corresponding change in the style of painted glass.... “The two first tiers of lights from the ground are filled with coloured borders and ornamented white quarries; a shield of arms in a panel is inserted in each light, and a small ornamented roundel placed at some distance beneath it. The three next tiers of lights throughout the window are filled with figures and canopies, and, in the central part of the window, another tier likewise, the spires of this row of canopies running into the tier of lights above. This arrangement, as might be expected, imparts a grand pyramidical character to the whole design. All the tracery lights of the window are filled with ornamented white quarries, and enriched with small roundels of ornament inserted here and there....