A Clerestory The upper range of windows of the nave; rising above the adjoining portions B Triforium Literally, a blind window--a range of openings, or possibly an arcade-effect only, coming below the clerestory and above the lower arches of the nave C Arch (between nave and ai Joining the piers or pillars which separate nave from aisles D Pillars (of nave) Commonly called pillars, columns, and piers, but more often are literally pillars, being made up of blocks of stone one upon another E Vaulting The stone arched roof F West wall Here, in the true Gothic church, is usually found a rose window, though often obscured by the organ case G Arcaded gallery A feature frequently seen in the interior of great churches, as distinct from the triforium. Either decorative or of practical value H Pavement The floor, always of stone, and often of marble or mosaic [Illustration: NO. 4. CROSS SECTION] A Flying buttresses A thrust support, or prop, extending from the main fabric to an outer pier B Timber roof The timber or scantling above the nave, which supports the outer tiled or leaden roofing C Nave The main body of a church D Aisle The passage which flanks the nave E Outer aisle A second or outer passage flanking the nave F Stairway to roof of aisle Stairways from the interior pavement, leading to triforium, belfry, or roof G Crypt In reality a lower or subterranean church or chapel; from _crypta_, to hide H Buttress pier The outer support of a flying buttress, or one lying directly against the wall which it strengthens INDEX Abelard, 94. Acquitaine, 176, 211. Adela, mother of King Stephen of Blois, 121. Agrippa, 134. Aisne, Department of the, 134. Alencon, Bishop of, 307. Alencon, Notre Dame d', 296-298. Amboise, Cardinal d', 84, 90. Amboise, Georges d', 85, 90. Amiens, 32, 35, 37, 61, 62, 117, 129, 133, 200, 267, 272, 278. Amiens, Bishop of, 65. Amiens, Cathedral at, 140, 141, 384. Amiens, Flying buttresses at, 67. Amiens, Notre Dame d', 64, 69, 72, 366, 367. "Ampoule, Sainte," The, 25, 143. Angers, 119, 149. Angers, Bishop's Palace at, 181. Angers, Castle at, 175. Angers, David d', 235. Angers, St. Maurice d', 147, 173-182, 367, 368. Angevine Churches, The, 215.