The principal TRIFORIUM-PIERS generally exhibit a row of light shafts on the face of a solid pier, carrying arch-mouldings of three orders, and separated sometimes by a line of dog-tooth moulding, or stiff foliage. The _secondary piers_ are usually single, double, or triple detached shafts, carrying the smaller arches. Where the Triforium contains three orders of piers, the _tertiary pier_ consists of a single shaft only, carrying the third order of arch-mouldings. The VAULTING-SHAFT usually terminates in an elegant capital, just below the Clerestory-string, the mouldings of which form in that case the impost mouldings of the capital. The ARCADE generally corresponds with the windows, and consists either of a row of continuous arches, of equal height, or, as is commonly the case, of three tall arches carried on a triple shaft, of which the centre one is the loftiest: the mouldings and ornaments being similar to those of the rest of the building. The VAULTING is generally simple, and acute, and usually of the quadripartite or sexpartite form. The AISLE-ARCADE consists generally of a series of plain, or trefoil-headed arches on single shafts, carrying the usual mouldings and ornaments. PRINCIPAL BUILDINGS OF THE LANCET PERIOD. LINCOLN Cathedral Church Choir. WORCESTER Cathedral Church Choir. WINCHESTER Cathedral Church Lady Chapel. FOUNTAINS Abbey Church Choir, East Transept. WHITBY Abbey Church Choir. YORK Cathedral Church N. and S. Transepts. BOLTON Abbey Church Nave. BEVERLEY Minster Choir, Transepts. LINCOLN Cathedral Church Nave. LICHFIELD Cathedral Church Chapter House. WELLS Cathedral Church West Front. PETERBOROUGH Cathedral Church West Front. SOUTHWELL Collegiate Church Choir. OXFORD Cathedral Church Chapter House. HEREFORD Cathedral Church Lady Chapel. LANERCOST Abbey Church Nave. DURHAM Cathedral Church East Transept. RIEVAULX Abbey Church Choir. LONDON Temple Church Choir. SALISBURY Cathedral Church Choir. WORCESTER Cathedral Church Presbytery. WHITBY Abbey Church N. Transept. ELY Cathedral Church Presbytery. CHAPTER VIII. GEOMETRICAL PERIOD. PRINCIPAL CHARACTERISTIC. SIMPLE GEOMETRICAL TRACERY IN THE HEADS OF THE WINDOWS, IN PANELS AND IN ARCADES. _Exterior Compartment._ The BUTTRESSES have frequently set-offs, and canopies attached to their faces, carrying often a series of CROCKETS: these in the earlier examples are plain, stiff, and curled; but the later ones are formed by a gracefully disposed leaf. Towards the end of the Period, the buttresses became very bulky and massive, and carried little or no ornaments.