Triforium.—An upper storey over the aisle of a church, with arches opening into the nave or choir.

Tympanum.—The space enclosed between the flat head of a door or window and the surmounting arch.

Undercroft.—A vaulted chamber underground.

Vaulting.—An arched roof or ceiling of stone or brick.

Winders (of a Staircase).—The steps sometimes formed where a staircase changes direction; they are wide against the wall and are narrowed almost to a point against the newel or string.

A Brief List of Books recommended for the Study of The History of English Domestic Architecture.

ADDY (S. O.)—The Evolution of the English House. Small 8vo. 1905.

TURNER (T. H.) AND PARKER (J. H.)—Some Account of Domestic Architecture in England during the Middle Ages. 3 vols. in 4. 8vo. 1859–1877.

GARNER (T.) AND STRATTON (A.)—The Domestic Architecture of England during the Tudor Period. 3 parts. Folio. 1908–1909.

GOTCH (J. A.)—Architecture of the Renaissance in England. 2 vols. Folio. 1891–1894.