The vaulting of a polygon with a central pillar assumed now a form of exquisite beauty. Its two special types in its simpler form are the Chapter-houses at Salisbury and Westminster,—truly a par nobile fratrum,—and claiming special attention as showing the extraordinary beauty attained by the use of ribbed vaulting united with the pointed arch.
Fig. 350.—Westminster Abbey. Vaulting of Aisle round Apse.
| Fig. 351. | Fig. 352. |
I have already mentioned that in this form of vaulting
