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- septs, which carry a tower, 29 feet by 25 feet, over the walls, rising to two
stories in height above the eaves, and crowned with a plain parapet, supported on simple corbels (see Figs. 984 and 994). The upper story has rectangular windows on each face, three of them filled with tracery of late patterns, and the one on the north with a window containing simple tracery
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Fig. 989.—Iona Cathedral. Caps of Piers of Choir and Crossing.
(Fig. 997). The lintels are composed of straight arches, supported by a remarkable shaft on the inside, which recalls the turned shafts of pre-Norman work. The access to the tower is by a small wheel staircase at the south-west angle of the crossing. The original doorway of the staircase entered from the nave, but, after the Reformation, the adjoining
