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98
GOTHIC ARCHITECTURE
CHAP.
in the large constructive members, and finally in every detail. Fig. 53 and 54, portions of the interior and exterior, respectively, of this apse will illustrate these remarks.
FIG. 53.
The vaulting of the apsidal aisles presented difficulties which had been very embarrassing to the constructors previous to the employment of the pointed arch and the adoption of a system of supporting ribs. These difficulties grew out of the peculiar forms of the spaces to be vaulted—
