In the windows of the clerestory are to be seen some fragments of old glass. The windows, which are of three lights, contain portions of ornamental borders with quarry glazing, and some medallions, stars in the foliations, and borders of crowns. Mr Waller thinks it was "probable that all these windows were originally filled with glass of this kind, which is similar in general design to that in the upper tiers of the clerestory windows in the choir." The tracery of the windows in the clerestory is ascribed to Abbot Morwent, who rebuilt the west front. The #Monuments# in the north aisle are of no special interest. That to Bishop Warburton at the west end contains an epitaph that is worth reading. Next to it is an ungainly tomb, filling up an enormous wall space, with a depressing effect. Farther eastwards is the tomb by Flaxman to the memory of Mrs Morley, who died at sea in 1784 (p. 121). The tomb to Alderman Machen, his wife, and family is interesting (1615), and is one of the few tombs that has not been removed from its original position. The nave is lighted by rows of gas jets along the triforium or gallery, extending over the arches of the nave. The effect is good when the building requires to be lighted by artificial light, but the fumes and smoke from the gas have sadly discoloured the small columns and the arches in the triforium, and no doubt in time to come more serious mischief to the stonework will be developed. The fumes of the gas will also be fatal to the decorative pipes of the organ, and, with the assistance of the fumes from the radiators, will ruin any memorial brass that may be erected in the building. Wires have been stretched across the nave to prevent the excessive echo from marring the effect of the music, but many curious echoes are to be heard. The mocking sounds that follow upon the sounds of the voice of a preacher, especially when the attendance is small, are very weird. They may be heard best from the last few rows of seats near the west end.