As it is impossible to make a complete circuit of the church, it is as well to begin at the north transept. Here a wall will be found projecting from the north-east corner, of which the western face is in a very dilapidated condition. This wall contains a good Early English pointed arch, which is now filled up with stonework and contains a modern window. At the sides of the arch are Purbeck marble shafts with a central shaft of the same, which divides it into two subordinate arches, with an opening in the spandril between them. The base of the dividing shaft is a block of marble, curiously carved, representing four cats playing round the column. Each of the cats has in its mouth the tail of the cat immediately in front. On each side are the remains of a smaller recessed arch, and the only portion of the north wall which is still standing contains one bay of a trefoil-headed arcading which formerly was carried round the walls of this chapel. On the north wall of the transept the four bays of the vaulted roof are discernible, and a fine Early English doorway in the wall (lately restored) used to give admission to the main building. Originally, when the church was perfect, this was an open arch. At the last restoration a wall was built up inside, so that the arch might be left clear. This chapel can hardly have been the one mentioned on p. 13, which was dedicated to St. Eustachius, and was consecrated in 1246 by Prior Henry de Banbury. It is much more likely to have been the nave of the Early English Lady Chapel, of which the enclosed chapel to the east was the choir. Bristol Cathedral has its elder Lady Chapel in a similar position, though it was no doubt originally quite detached from the main building. The corner buttress at the north-west angle of the north transept was erected about the year 1720, and there is a corresponding support to the south transept at its south-west angle. The clerestory on this north side of the nave has a Norman arcade, supported on short shafts, which extends from the tower to the west front. The insertion of the later windows, which presumably were enlarged when the nave was vaulted, has destroyed the regularity of the arcading. A flying buttress of very slight proportions will be seen on the north side between the north transept and the north porch. =North Porch.=--For a porch of Norman construction this is of unusual dimensions, measuring 24 feet by 20 feet and 39 feet high. It is extremely simple in character inside and out. The roof is a plain barrel vault of stone. Both the internal and the external doorway have a circular arch composed of a series of mouldings supported by shafting, just as in the arch of the great west window. Over the outside door of the porch stood an image of the Virgin Mary with the infant Christ, typical of the Incarnation, but it has suffered much at the hands of would-be zealots. Over the porch is a room or parvise, very difficult of access and badly lighted.