The church throughout is vaulted with a pointed barrel vault, but no provision has been made for the vaulting of the nave. Crichton Church was converted, in 1449, by Sir William Crichton, well known as Chancellor Crichton, into a collegiate establishment for a provost, nine prebendaries, and two singing boys, and was suitably endowed. The existing structure was probably erected at that time. Sir William also built an extensive addition to the Castle of Crichton, and doubtless the same builders were employed on church and castle, as many of the details closely resemble each other. From Mr. Gourlay’s letter, already referred to, it appears that there was a provost’s house about a mile distant. He mentions that it was then used as a farmhouse and called Rosehall, and that there was a place of worship beside it and a churchyard, but with the exception of the latter nothing now remains. The tower is supported by pointed arches springing from responds in the four sides. The responds are of simple section, and the caps contain some good late foliaged carving (see Fig. 1171). The walls are carried up with one low story above the set-off [Illustration: FIG. 1171.--The Collegiate Church of Crichton. Arch and Screen in South Transept.] immediately over the sloping water table of the roofs. This story contains, in each face, a two-light window with square lintel and central mullion. The story is surmounted by a plain parapet, supported by a corbel course, and the tower is finished with a gabled roof, having a simple belfry on the apex of the east gable. THE COLLEGIATE CHURCH OF CORSTORPHINE, MID-LOTHIAN. The village of Corstorphine is situated about three miles west of Edinburgh. The church is intimately associated with the Forrester family. It was erected and endowed by them, and their tombs and monuments, emblazoned [Illustration: FIG. 1172.--The Collegiate Church of Corstorphine. Plan.] with heraldic emblems, are conspicuous on its walls. The manor was acquired by Adam Forrester, a burgess and provost of Edinburgh, in the year 1376, and the title of Lord Forrester of Corstorphine continued in the family till the year 1763. There was a chapel at Corstorphine as early as the year 1128, which was granted to the new Abbey of Holyrood. This structure afterwards became the parish church, and continued to be so after the erection of the collegiate church, which still exists. Of this original chapel no trace now remains. It stood on the north side of the present building, on part of the ground now occupied by the existing north transept. This transept, which was built in the present century, is not the immediate successor of the old parish church, but takes the place of an aisle which was built in 1646, the erection of which caused the removal of what remained of the old parish church.