Page:Charles Moore--Development and Character of Gothic Architecture.djvu/111

Rh nave of St. Leu d'Esserent (Fig. 47) show the first step of this development in the grouping of two or more openings under one enclosing arch. Grouped openings had, indeed, been employed much earlier. Twin round-arched windows occur in the clerestory of Noyon; and in the triforium of

FIG. 47.

St. Germer (Oise) coupled round arches surmounted by a circular opening occur. The same arrangement is partly carried out at a still earlier date in the triforium of the Norman Church of Cerisy-la-Foret (Manche), where the circle over the arches is not pierced through the tympanum, but is formed by a moulding on its face. In the triforium of the nave of Noyon are coupled pointed arches with a