The interior of the choir (Fig. 1147) is extremely simple. It is roofed with a pointed barrel vault, the surface of which, towards the east end, is ornamented with moulded ribs. These ribs spring from corbels in each angle of the apse and in the side walls, and extend to nearly the centre of the choir, where they cease, leaving the remainder of the vault plain. The idea has apparently been, by the introduction of these ribs, to make the presbytery somewhat ornamental. The windows, being below the [Illustration: FIG. 1147.--Seton Collegiate Church. Choir, looking East.] springing of the vault, are necessarily low, and the vault is in consequence dark. There are a plain sedilia, with elliptic arch, and an ornate piscina (Fig. 1148) at the east end of the south wall. Opposite them in the north wall a monument (Fig. 1149) under the north-east window contains, in an arched recess, an effigy, probably that of the second Lord Seton, who erected the church into a college. The choir is now roofed with wood and slates above the vault, but it was no doubt originally [Illustration: FIG. 1148. Seton Collegiate Church. Piscina in Choir.] covered with a roof of overlapping stone slabs. The door to the sacristy is opposite that in the south wall. The sacristy is about 14 feet by 12 feet. It has a plain barrel vault, which supports an upper story, of which the window is visible (Fig. 1150), but there is no apparent means of access to it. The building has a roof of overlapping stone flags. The sacristy has one small eastern window, with a piscina near it, and a fireplace. In the angle next the apse there is a squint commanding a view of the altar. The tower is 25 feet square. On the ground level there are arched openings 9 feet 6 inches wide (Fig. 1151) towards the choir and each transept, and also in the west wall towards the intended nave, the latter being built up. The stair turret is placed at the south-east angle, and partly projects into the south transept (Fig. 1152). It is also visible on the exterior (see Fig. 1145). The tower is carried up over the crossing one story in height above the roof, and is crowned with a broach-spire, the top of which is unfinished. This is one of the very few examples of broach-spires in Scotland. The ground floor over the crossing is groin vaulted, and has a circular opening in the centre. The transepts are each about 27 feet long by 18 feet wide, and each is divided into two bays, with buttresses, pinnacles, and traceried windows, similar to those of the choir. These traceries were all much damaged, but they have been repaired by Lord Wemyss. The vaulting (see Figs. [Illustration: FIG. 1149.--Seton Collegiate Church. Monument under North-East Window.] [Illustration: FIG. 1150.--Seton Collegiate Church. View from North-East.] 1151 and 1152) is of the pointed barrel kind, similar to that of the choir, but without ribs, and supports a roof composed of overlapping stone flags