When the Perpendicular architect arrived upon the scene, he found the canopy window already well developed. The shape of the embrasures which he provided were peculiarly suited to this agreeable method of glazing. The straight upward sweep of his mullions made easy an effective adjustment of the narrow canopy-framed niches, and left the artist little to do but elaborate the more modest sentry-box of the Decorated period. This he did in a very artistic and pleasing manner. The signs of development are easily distinguishable, and chief among them are the elaboration of the architectural detail of the canopy (by increasing the number of pinnacles and drawing them in relief instead of flat), and the completing of the frame effect by adding elaborate pedestals below the feet of the figures. We must remember that the earlier glazier either placed nothing below the enframed figure or else, in a few instances, heraldic shields (as at Tewkesbury). In many instances the earlier solitary figures within the canopies now give way to groups, although not so frequently as in France. The glazier did well to abstain from this change as much as possible, for although it is logical to find a saint within a shrine, nothing could be more absurd than to install therein a rural scene or a small battle picture. The Perpendicular architect, unlike his Decorated predecessor, was not content to leave the tracery lights differentiated from the rest of the window below. Instead, he tied the upper and lower lights together by carrying his mullions straight up through them all, and thus deprived the tracery ones of the independence as well as the decorative success they formerly enjoyed. In a few instances (as at Great Malvern), the glazier accentuates the stiff regularity of these upper lights by filling each with a canopy-enclosed figure. Lest the upright parallel lines of the mullions lend too monotonous an appearance, care was generally taken to make two of them (usually thicker than the others) swerve outward when nearing the top of the embrasure, one to the right and the other to the left. These two thicker mullions served the further artistic purpose of breaking the line of tall lights into groups of two or three each. This can be observed in the illustration. The chief features of this school are as follows: (_a_) Increasingly lighter and softer tones; (_b_) Stiff parallel lines of upright mullions; (_c_) Tracery lights lose their independence; (_d_) Greatly elaborated canopies; (_e_) Stipple shading, replacing the earlier smear shading. It can be said with no fear of contradiction that we have now arrived at the finest period of English glazing. PERPENDICULAR TOUR