Page:The ecclesiastical architecture of Scotland ( Volume 3).djvu/88

 These arches gave a view of the altar from a high chapel, which, as will be pointed out, was perhaps connected with the library or dormitory. The chapel has been added to the church, and the walls are not bonded into the choir. The decoration of the upper portion, with its imitation dog-tooth or nail-head ornament round a straight sided arch (Fig. 1001), shows that it is of very late date.

—Iona Cathedral. Interior of Sacristy and Chapel above.

This structure appears to occupy the position of the original north aisle, which at one time extended (or was contemplated) the full length from the presbytery to the north transept. The water table over the old aisle roof runs the whole length, and has a sloping water table where the roof abutted against the north transept. The old corbels to receive the timbers of the aisle roof also still exist. The aisle would no doubt block one of the Norman transept windows, but that could not be avoided.