This arrangement of the side aisles proves the continuity of the Norman formulæ, just as the method of construction adopted in the main vault demonstrates the persistent influence of the dome.[10]
[10] See chap. i., "The Influence of the Cupola on Gothic Architecture."
The admirably constructed main vault is square on plan, each square containing two transverse compartments, after the Angevin method as derived from the Aquitainian dome. Here we find indications that, if the builders of the Church of Laon had fully assimilated this method, their minds were nevertheless not altogether at rest as to the functions of the flying buttress. This was, of course, essential to the piers which received the united thrust of both transverse and diagonal arches. But it was far from logical to reinforce the intermediate piers supporting nothing but the auxiliary transverse arches by abutments identical with those of the main piers.
The illogicality so striking at Laon is absent from Noyon. There, on the contrary, the architects—of the original construction—had emphasised the functions of the main piers by buttresses of greater projection and solidity than those accorded to the secondary piers.
35. CATHEDRAL OF LAON. THE EAST END
36. CATHEDRAL OF LAON. SECTION OF THE NAVE