RECTILINEAR PERIOD.

of its being drawn from four different centres: its use,however, in arches of construction, except in tlie Vaulting,is by no means so common as in arches of decoration,where it continually appears. It is often enclosed indoorways, under a square head. The mouldings of tirePier-arches, Window-arches, and all others are usuallyplain, broad, and shallow ; the double Ogee occurs con-tinually, as well as a large shallow hollow, drawn fromthree centres, between a few small filleted members.Few Arches carry more than two orders.

In the String-courses, Cornices , and other hollowmouldings, flat square leaves at intervals, continuoustrailing foliage, and the vine-leaf and grapes, frequentlyoccur; but the relief is usually not considerable, andthe amount of undercutting in foliage exhibited in thetwo previous Periods is never seen. The Tudor Rose,and the Tudor Flower, are frequent ornaments of thisPeriod.

The Triforium is rarely seen, and in its place theClere-story-Window is often carried down in blank panel-ling to the passage or String-course over the Pier-arches.It is sometimes, however, represented by a band ofpanelling or pierced work.

The Clere-story attains considerable height and im-portance in this Period; the effect of which, in largebuildings, is increased by the suppression of the Trifo-rium, and the substitution in its place of the apparentcontinuation downwards of the Clere-story. In manybuildings the Clere-story-windows are in pairs, and sonumerous that all blank wall entirely disappears; andthe effect of the mass of light thus poured down into theChurch is very striking and characteristic.

The Vaulting becomes much more complicated andenriched in this Period. Diverging ribs having bossesand shields at their points of intersection, cover thesurface of the Vault: the plans of these vaultings are

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