_Bay_ The space between two piers from the floor to the roof. _Bosses_ The ornamented keystones of a vault. _Buttress_ A projecting support to a wall. _Cathedral_ Any church, large or small, which contains the seat (_cathedra_) of a bishop. _Chantry-chapels_ Private chapels; in which were chanted masses for the repose of the soul of the founder of the chapel. _Chevet_ The ring of chapels round the east end of a choir or its aisles: _e.g._ Westminster. _Choir_ (1) That part of the church where the clergy or monks sat. (2) The whole eastern limb of the church. _Clerestory_ The upper story of a church. Also the row of windows in the upper story. _Corbel_ A bracket of stone or wood. _Corbel-table_ A row of corbels supporting a parapet or a projecting roof. _Crockets_ Tufts of leaves arranged in bands. _Crossing_ The space where nave and transepts intersect. Above it is often a central tower. _Crypt_ The underground portion of a church. _Cusps_ Spikes in the tracery of a window. _Dripstone_ A projection running round the head of a window to throw off the rain. _Eaves_ That part of a roof which overhangs the wall. _Elevation_ (1) A geometrical drawing (_i.e._ not in perspective) of a vertical portion of a building. (2) The portion so drawn. _Façade_ The principal external elevation of a building. _Feretory_ (1) A portable shrine. (2) That part of the church which contained the pedestal of the shrine: _e.g._ Winchester; also called Saint’s Chapel. _Fillet_ A narrow projecting stone band, like a piece of tape; square in section. _Flying buttresses_ Tilted arches rising from the buttresses of the aisles to the clerestory wall to resist the thrusts of the high vault. _Gargoyle_ A projecting water-spout. _Groined vault_ A vault which, instead of ribs, has sharp edges or arrises. _Hood-moulding_ An ornamental dripstone employed in interiors; especially over pier-arches. _Jambs_ The sides of a window or doorway. _Label_ A dripstone over the exterior of a doorway. _Lancets_ Sharp, pointed windows; in the shape of a surgeon’s lancet.