[Illustration: FIG. 1179.--The Collegiate Church of Corstorphine. Tomb in South Transept.] collegiate church was founded and endowed by Sir John. Although the inscription to Bannatyne, the first provost, says that it was begun in 1429, the foundation was only completed by a Papal Bull in 1444, at which date Sir John was probably living. The foundation consisted of a provost, four prebendaries, and two singing boys. From the above records, and also from the style of the architecture, there can scarcely be a doubt but that the church to the west was the collegiate church erected after 1444, and in designing it, the plan was so arranged as to incorporate the older Chapel of St. John the Baptist as the chancel of the new church. It is remarkable that, although the chancel [Illustration: FIG. 1180.--The Collegiate Church of Corstorphine. Tomb in South Transept.] contains monuments to his successors, there is none to Sir Adam, the supposed founder of it. It may, however, be mentioned that Mr. Laing believes that an inscription on a stone, which has been built out of its proper place, in the small porch to the west of the tower, has been taken from a monument to Sir Adam. Whether the above view of the history of the Church of Corstorphine is correct or not, the chancel or the Chapel of St. John the Baptist is the [Illustration: FIG. 1181.--The Collegiate Church of Corstorphine. Window and Arms in South Transept.] most interesting part of the building. It measures internally 25 feet 6 inches in length by 21 feet in width, and is covered with a pointed barrel vault, having a roof of overlapping stone flags. It contains an [Illustration: FIG. 1182.--The Collegiate Church of Corstorphine. View from South-West.] east window of three lights (Fig. 1174), having perpendicular tracery, the lower part of which has been altered, as above pointed out. There are two small windows in the south side of the chancel, and between them, in the interior, is a fine sedilia, somewhat mutilated (Fig. 1175). Beside it is a piscina (Fig. 1176), with the basin, as usually happens, cut away. In the niche of the piscina there is a stone shelf used as a credence table, and over the niche a projecting round canopy. A very similar canopy exists over the upper small niche on the exterior of the east gable.