Not only do the most ancient traditions of all Oxford linger about Merton, but it looks the part--it conveys the impression of its extreme age to any one who enters its gates. Mob Quad is the oldest quadrangle in the whole University. Bishop Walter de Merton, Chancellor of Henry III., devised the idea of segregating the students into colleges, so as to govern them better, and to render more difficult, if not impossible, the general lawlessness and bloody frays between nationalities that used to be so frequent. A visit to the chapel will not only show us glass of the early part of the Decorated period, but in such quantity and so well placed as to give one the best possible impression of it. The large east window is filled with modern glazing, only the upper half of the traceries above retaining the original red and blue diaper work. In addition to this great embrasure, the choir is lighted by seven ample three-lanceted windows on each side. These are filled with grisaille bordered in colour, while across them, about two-thirds of the way up from the bottom, is drawn a band of strongly hued canopied figures. Because of their early manufacture we are not surprised to find the canopies very crude, lacking pedestals, &c. The enclosed backgrounds are generally blue, although a few toward the east are red. In the central lancet of each embrasure the canopy usually contains an upright figure, while in the side lancets they are almost all kneeling. Each personage has a written label which either winds gracefully over his head and down behind his back, or runs along beneath him. The borders are not carried up into the traceries; their design is sometimes a vine, sometimes yellow castles, or fleur-de-lis of white or green. In addition to the band of canopies, the duller grisaille is further enlivened by three coloured bosses in each lancet, mostly containing heads. The western end of the choir opens into the antechapel, which lacks its ancient glazing except for the fragments gathered together into the central western embrasure, whose original tracery glass, however, remains intact. Before leaving Merton mount the stairs to the quaint L-shaped library and inspect its attractive remains of Renaissance glass. Along the lower side of the east wall of the north wing are seven narrow lancets filled with dainty grisaille quarries, bordered in faint colour and bearing a brightly toned boss. Of more importance to us, however, is the pleasing bay window at the east end of the south wing. Here we find quarries of soft grey, each containing a monogram in yellow stain. In the midst of these quarry panes are placed little scenes, circular in form and decorated with enamel paint in grey and stain, each bearing a German inscription. The central embrasure contains six of these, three above and three below, and the two side bays have two each, one above the other. They bear the date 1598. An account of the Perpendicular glass at Oxford will be found at p. 142.