The windows in the clerestory of the nave of York Minster are little, I think, if at all, later than those in the Chapter-House, but it is a little difficult to compare them as they are designed to be seen at such a very different distance from the eye, the white parts of the clerestory windows consisting only of interlacing bands of lead-work without any painted pattern at all. A small inset in Plate XVIII. shows the general arrangement of all these windows; the great wheel of the tracery, it will be seen, is filled with colour, while the lower lights are white with two bands of coloured panels running horizontally through them all. Of these panels the lower row consists of coats of arms of the great families of the North, contained in medallions of which Plate XVI. is an example. The upper row consists for the most part of subjects contained in somewhat similar medallions, but many of the panels are filled with earlier glass of the twelfth and thirteenth centuries, which were doubtless preserved from the older nave. Thus, if you let your eye run along the northern side it will be arrested at the extreme west end of the line by a piece of blue that is different from all the others. It is the twelfth century blue that we have seen at St. Denis and in the west windows at Chartres, and the panel is the portion of a Jesse Tree of the same pattern as that which is found at both those places, and which I mentioned when speaking of them. Portions of the foliage of the tree are in the tracery above. I think I recognize this blue too in a panel on the south side representing a man with a horse and cart, and remains of early thirteenth century glass are plentiful. [Illustration: PLATE XXXI THE ANNUNCIATION, FROM ST. OUEN, ROUEN Fourteenth Century] [Sidenote: The aisles of the nave.] Next after the clerestory, the oldest windows in the nave are the first five from the east in each aisle. In these the style of the Second Period is fully developed and is in no sense transitional. They are rather more advanced in style than the Merton College windows and are by a far finer artist, being, in fact, the finest work of the period that I know. They seem to me all to have been executed within a few years of each other, probably in continuous succession, and to show the gradual development which might be expected during the progress of the work.