Page:The ecclesiastical architecture of Scotland ( Volume 3).djvu/235

 time as the castle, the licence for the erection of which is dated 1430. William de Borthwick, a man of some eminence, was created Lord Borthwick shortly before that date, and the aisle is believed to have been erected by him. This aisle is vaulted with a pointed barrel vault, covered on the

—St. Mungo's Church. Plan.

outside with a stone roof (Fig. 1137), to resist the thrusts of which massive buttresses are provided. The roof consists of overlapping stone flags, carefully wrought, and the cornice at the wall head (Fig. 1138) is ornamented with carved heads and leaves alternately. The chapel contains in the