Dome, the, in the Eastern Empire, i. 47, 49; 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; ii. 136, 149; in early Irish remains, 22; in round towers, 25; in Anglo-Saxon work, 37, 42, 43, 47, 48; in Norman work, 76, 77; in all good Gothic, 77, 142. Dorchester Abbey, choir, i. 287. Doric, ii, 299; race, 301; temples, 302; Grecian, some resemblance to the rock-cut tombs of Beni Hassan, 298. Dormer windows, i. 265. Dover, church on the Castle-hill, ii. 41; splayed windows, i. 278; ii. 42; doorways, _ibid._; tower and ancient Roman Pharos, 43; tower arches, _ibid._ Dover Castle, i. 114, 308. Drawing, lessons in, i. 339. Drip-stone, or label, i. 225, 249. Dryburgh Abbey, i. 122, 249. Dunstable Priory Church, i. 188. Dunstan, St., ii. 33, 58. Durham, refectory, Anglo-Saxon crosses found in, ii. 57; kitchen of the monastery, 203; castle at, 150. Durham Cathedral, ii. 120, 124, 126-129, 135; galilee, i. 106; chapter-house, 107; chapel of the Nine Altars, 140, 201, 286; groining to the central space, ii. 88, 128; transept aisles, 89; coupled bays, 124; Carileph’s design, 126, 127; gabled roofing to the aisles, 129; crypt, 159. E Eadbald, the son of Ethelbert, ii. 44. Eadmer, the writings of, ii. 27, 28. Earls Barton tower, ii. 52, 58. Early French windows, i. 159. Early Pointed, fully developed, i. 139, 341, 346; windows, fully developed, 159, 160; cathedral bay, 243.