On either side of these again traces of a four-centred arch showed faintly through the smooth ashlar at the back, and on removing the ashlar two beautiful windows were disclosed. They have their saddle-bars and stancheons _in situ_, in some places almost rusted through, and it is clear that the windows have not been, nor were they intended to be, glazed. Another interesting point is that they seem scarcely to have been finished before they were walled up again, for the masonry has not even been rubbed down. This seems so unusual a treatment for windows of such refinement, that one is tempted to conjecture that some zealous subordinate of the Bishop’s, anxious to give him a pleasant surprise, had, during his absence, caused these windows to be made, but on his return the incensed prelate promptly ordered their immurement. A squint was, however, left in the centre light of each window, so that from the Trinity Chapel altar the celebrations at those at the east end of the north and south aisles could be seen. When removing the masonry in 1898, it was decided to leave these squint-stones in order not to destroy an important link in the history of these windows. [Illustration: NICHE, BISHOP VAUGHAN’S CHAPEL.] Curiously enough, the backs of the windows, towards the ambulatory are different from the fronts (one of which we illustrate) and have merely four-centred arches. [Illustration: BISHOP VAUGHAN’S CHAPEL.] At the north end of this chapel is the tomb of Archdeacon Hiot and that of Sir John Wogan, recently brought here for the sake of preservation. The former stood in the chapel of St. Nicholas. Bishop Vaughan’s own tomb is in front of the altar, the leger-stone once bearing a brass on which was engraved his effigy.[64] Several Celtic stones bearing crosses, which were found at Pen Arthur, are at present in this chapel. The earliest--from the eighth to the eleventh century--Professor Westwood found doing duty as a gate-post on a farm. The holes show the marks where the hinges were. At the top, on the left, can be read Α Ω and (?) JHS. On the right is XPS, cut after the corner was broken away, and below is “Gurmarc.” On the back is another cross of a still earlier character. It is supposed to have commemorated some battle fought in the neighbourhood, and was found on the moor.