The windows are divided by the tracery into narrow lights in which a series of coloured medallions of typical thirteenth century shape are placed one above the other on a ground of grisaille, much as in the window from Poitiers. It is in the grisaille itself that the beginnings of the new style are shown, for whereas in the "Five Sisters," which are certainly later than 1260, the pattern on the grisaille is the conventional trefoil of the First Period--the Herba Benedicta--and conforms to the shapes of the lead-work and of the hollow medallions outlined in coloured bands, in the Chapter-House, although the medallions in coloured outline are still there, the painted pattern, as at Exeter and Troyes, runs through them independently of them (giving them a rather meaningless appearance of being hung in front of it), but is wholly formed of natural foliage, oak, fig, ivy, and so on; the borders, too, are of the character of the Second Period. Similar grisaille is found at Chartham in Kent. At Poitiers, as may be seen in the illustration, the grisaille pattern is still of the Herba Benedicta, with a cross-hatched ground, and the border is of an earlier type; at St. Urbain at Troyes, as at Exeter, both the conventional and the natural foliage are found, but on the whole I am somewhat inclined to think that wherever the other features of the style originated these patterns of natural foliage were first used in England. These windows, by the way, are in a sad state and want releading, instead of which the authorities have contented themselves with placing quarry glazing on the outside of them, which now that it is dirty so darkens the old windows as to kill all light and colour in them. When I say releading, I mean that and nothing more--_not_ "restoration," which is murder. [Sidenote: The Chapter-House vestibule.] The windows in the =L=-shaped vestibule, or passage, which leads to the Chapter-House show a slight further development. Here the grisaille is of the same character as in the Chapter-House itself, but the coloured panels are each surmounted by a little crocketted canopy, which here appears for the first time in York. It is found in some glass at Selling, in Kent (which from the heraldry seems to commemorate Edward I.'s marriage to Margaret of France in 1299), in conjunction with grisaille in which the foliage is of the earlier conventional type, and which therefore may, perhaps, be a little earlier than these windows. [Sidenote: The clerestory of the nave.]