ARCHES, CENTRES.—Window and Door Heads.—Semi-circular Arch—Segmental
Arches.—Stilted Arches.—Horseshoe Arch.—Lancet Arch.—Equilateral
Arch.—Gothic Tracery.—Wheel-Windows.—Equilateral Tracery.—Square
Tracery.—Finished Leaf Tracery.—Twenty-Two Illustrations.