the opening into the nave, and form parts of the piers of the great archway from the tower into the church. This opening, which is now blocked up, was about 17 feet 10 inches wide, and was arched beneath the vaulting (see Fig. 1052). The tall angle shafts have bases and caps, the mouldings of the latter being continued along the bevelled walls. The vaulting ribs do not spring directly from the four angle shafts, as there appears to have been an intermediate floor of timber (or a gallery along the sides), which rested on the angle shafts and on large corbels visible in the side walls. Over each of the main shafts there rises, for about three feet or so, a group of very delicate shafting, having carved caps, from which spring the ribs of the groining. These delicate shafts are quite a contrast to the massive lower shafts, and, at first sight, suggest the idea of a great change having been effected in the vaulting at some later period. The mouldings above the small upper shafts are carried along the west wall and ingoing of the large window (see Fig. 1051). There is a considerable resemblance between the treatment here and that at the large west window in Paisley Abbey. There are stone benches round three sides of the tower. Over the large west window there is another window (see Fig. 1047), with round arch-head, entirely filled with tracery, composed of small cusped circles, and above it a two-light pointed window. The tracery in the first of these windows recalls that in the tower windows of Iona Cathedral.