[41] Triforium: Properly, a gallery more or less open, built in the wall opposite the aisle roof, and therefore above the great arches of the nave and choir and below the clearstory windows. Often, a gallery in the wall below the clearstory but less accurately placed.
[42] Chevet: In mediæval and especially Gothic architecture the rounded end of the choir including the aisles which pass around the sanctuary and the chapels outside of the aisles. The shape may be curvilinear or polygonal. The original term in French is applied to square east ends also; but this is hardly accepted in the English usage.
[43] Thermæ: In Latin an establishment for warm baths: a plural noun used for a single building or group of buildings. The Thermæ of Caracalla mentioned in this chapter, occupied all the space within a bounding wall which formed a square of 1,100 feet (about twenty-eight acres) and within this were gardens, running grounds and the like, and among these the massive central building itself, 400 × 750 feet, twice the space occupied by the capitol at Washington, which is also immeasurably less massive and permanent in structure.
[44] Risorgimento: See note, p. 46.
[45] Archivolt: the outer vertical face of an arch; and, where there are several concentric arches, the general outer face of the whole group; that face which seems to form part of the wall in which the arch is built.
[46] Intrados: The under or concave face of the solid structure of an arch.
[47] Classicismo: The epoch of close study of antiquity, 1520 to 1570.
[48] Chaîne: In French, a system usually vertical of larger and more perfectly dressed stones in a wall of lighter or rougher material. Thus the quoins at the corner of a building and the alternately long and short stones at a window opening or door opening are chaînes, but the same device may be used to stiffen a long and unbroken wall.
[49] Rocaille Decoration: That which had originally a rough imitation of natural rock forms mingled with shells; a fashion passing rapidly into scroll-work in relief, giving very peculiar shapes to panels, doors, window-casements and even to details of masonry. The rococo style is partly based upon rocaille decoration.