as to liven any bits of stonework necessary to his drawing. It made possible the development of an unimportant detail in the earlier windows into the perfected result called the "Canopy window," which we shall learn to know as a most useful and satisfactory combination of decoration and serviceability. It will be remembered that from the earliest times there frequently appeared above the heads of saints certain conventional coverings meant to indicate an architectural shelter. Upon the arrival of the Decorated period this detail became more complete, the roof being fully depicted (although as yet in flat drawing, with no attempt at perspective) and columns added at the side to support it, thus completely enclosing the little figures in a niche. Here we have the first, or Decorated canopy, now complete in form although crude. It must be noticed, however, that these canopies, generally drawn to a small scale, do not attempt alone to fill the embrasures, and either are shown in bands across a ground of grisaille or occur alone surrounded by grisaille. Their architectural portion is of a strong brassy yellow, that colour being provided by pot metal glass leaded in. Now comes the next and final development. The discovery of yellow stain did away with the laborious need for leading in the yellow bits to simulate stonework, so the limit as to size of the canopy was removed, and at once they began to increase in dimensions. The obvious result ensued, each canopy was made to fill an entire lancet, its simulated stonework occupying as much surface as the enclosed figure, and we have the logical whole of a decorative colour panel within surrounded by a frame of lighter panes which admit the necessary amount of illumination. So satisfactory did this style of window prove that it persisted longer than almost any other type of glazing, and we must remember it is the discovery of yellow stain that we have to thank for making this result possible. During the period we are now considering, the canopy was, of course, rather crude, in fact it looked more like a sentry-box than anything else. There was as yet no pedestal beneath it, and the pinnacles at the top showed entire ignorance of perspective, as well as of drawing in relief. During the Perpendicular period that followed, they did little but elaborate this canopy idea, combining and softening the colours so as to prevent jarring contrasts, and generally much improving the logical combination of a coloured central portion surrounded by light-admitting canopy framing. Without the use of yellow stain all this would have been difficult, if not impossible, for without the little touches of gold livening the grey stonework these canopies would have been dull and unconvincing.