Jackson, Thomas Graham, Sir, 1835-1924 · Cambridge, University Press · leaf 121
to a cupola, for which a Avignon,square base is necessary. A square base therefore had cupolato be formed by a succession of arches turned from oneof the great transverse ribs to the other, gathering overin a succession of concentric orders towards the centretill the square plan was attained (Fig.… … ■F Fig. 87 (VioUet-le-Duc). CH. XX] FRANCE—PROVENCE 65 western doorway of the porch is distinctly based on Avignon,Roman example, so much so as to have led the unwary ^ ^°^^to pronounce it actually Roman work. Though obviouslynot antique, it is hard to fix its date. Fergusson thinksboth the doorway…
