ii. 153, 168, 169, 171, 172, 174, 228-289;

contemporary with our mediæval structures in neighbouring countries, 229; the earliest known assumes in section the pointed arch, 230; the great outward pressure requires abutment or ties of metal, 231; independent of a keystone, _ibid._; can be erected without the aid of centering, 232; any reasonable form of building may be covered by the, 240; development explained, _ibid._; segmental as well as semicircular in section, 241; pendentive, 242, 273; as a central point of Christian temples, 245; introduction of the, throughout Italy, thence to the south-west of France, 261; derived from purely Roman traditions, 261, 276; covered by lofty domical towers of timber surmounted by turrets at the apex, 265; introduction of pointed arches for its support, 267-269, 271; ceases to be Byzantine and becomes Gothic, 273; the _modern_ type of, 277-289; early, of northern Italy, 278; threefold structure of, at St. Paul’s, 285; artistic difficulty of making the same dome look well from within and without, 246, 286; constructive difficulty of balancing a steeple on the top of, _ibid._; scheme of plan for dome of St. Paul’s and St. Peter’s, 287; in Italy during the Middle Ages, 288.

Domed, architecture at Angoulême, i. 99; construction, ii. 6, 153; aisles at the Abbey Church, Bernay, 65.

“Domed-up” vaults, ii. 171, 187.

Domestic work, i. 340, 350.

Doorways, at Chartres, i. 87; at Jedburgh, 108; sculpture of, 147; French and English, 165; system of constructing, 228, 257;