The western aisle of the south transept is open; that of the north transept is cut off by a Perpendicular stone screen, which is solid in the southern bay, and through carved in the northern. The latter is, however, boarded up, and used as the vestry of the priest-vicars, the other being the vestry of the vicars-choral. From the priest-vicars' vestry a door leads into a small chamber now used for the water supply, and over the doorway there is a small and pretty figure of a woman under a little niche. There are a very few fragments of Early Perpendicular glass in some of the upper lights of the nave and transept windows. There are also two modern windows at the west end of the nave, and one in the south transept, of which I have been unable to discover the actual designers' names. TRANSEPT CHAPELS.--ST. MARTIN'S, where the obits of Savaric and Jocelin were celebrated, is separated by a solid Perpendicular screen from the adjoining chapel of St. Calixtus. It is now used as the canons' vestry. Partly blocking the old Early English doorway is the tomb of _Biconyll_, who was chancellor in 1454. His will, with a good deal of information about him, is given in the _Somerset Proceedings_ for 1894, by Mr A.S. Bicknell, a descendant. The name was originally Bykenhulle (A.S. for Beacon Hill), and has been spelt in forty-seven different ways. His effigy lies on the tomb, dressed in cassock, long surplice, and _cappa nigra_ or choral cope. The ends of the almuce can be seen in the opening of the cope, and its hood hangs over the shoulders.