A. Those which are called foiled arches, as the round-headed trefoil (fig. 10), the pointed trefoil (fig. 11), and the square-headed trefoil (fig. 12). The first prevailed in the latter part of the twelfth and early part of the thirteenth century, chiefly as a heading for niches or blank arcades; the second, used for the same purpose, we find to have prevailed in the thirteenth century; and the latter is found in doorways of the thirteenth, fourteenth, and fifteenth centuries. In all these the exterior mouldings follow the same curvatures as the inner mouldings, and are thus distinguishable from arches the heads of which are only foliated within.
CHAPTER III.
OF THE ANGLO-SAXON STYLE.
Q. During what period of time did this style prevail?
A. From the close of the sixth century, when the conversion of the Anglo-Saxons commenced, to the middle of the eleventh century.