Autun, Romanesque vaults of, i. 63. Auvergne, coloured stones in the buildings at, i. 277; domical churches of, ii. 94, 276. Auxerre, i. 326; Lady Chapel, ii. 197. Aveline, tomb of Countess, i. 180, 184, 311. Avignon, Nôtre Dame des Dons, church of, ii. 276. B Baalbec, i. 220. Babylon, architecture of, ii. 298. Baiæ, piscina at, ii. 156. Ball-flowers, i. 248. Baluster columns, ii. 37, 38, 41, 46; of Caen stone at Dover, 43, 102; at Jarrow, 47, 102; at Monk Wearmouth, 49, 143; sculptured on a stone in miniature at Jarrow, 50; mid-wall at St. Benet’s, Cambridge, 52; at Trinity Church, Colchester, 52; St. Alban’s, 102; Worcester, 123. Bamberg, cathedral at, i. 43. Baptistery at Nocera, ii. 238; Ravenna, 238, 239, 249, 259; Florence, 262, 280; Parma, 260, 263. Barfreston, windows at, i. 161. Barnach Tower, ii. 53. Barns, thirteenth century, i. 203; mediæval, 262. Barrel vaults, i. 49, 51; ii. 153, 170, 214, 247; converted into groined vaults, i. 55; main arches of, changed to pointed arches, 58; half-barrel vaults, St. Stephen’s, Caen, ii. 67; twin or parallel, 154. Bartholomew’s, St., Priory Church, Smithfield, i. 313; ii, 324. Barton-upon-Humber, ii. 53; western porch, 24, 53. Barton, Earl’s, tower, ii. 52. Base mouldings, sections of, i. 150; of buildings, 164, 249; to piers, ii. 80; of a wall, 84; Norman, 85. Bases, i. 146, 150. Basilica, Christianised Roman, i. 39, 51, 337; converted into a vaulted structure, 71; Roman, 48; windows of, 54; St. Peter’s, Rome, ii. 28, 29; secular, 20; at Ripon, built by St. Wilfrid, 32. Basilica Jovis, i. 338. Basilican style, i. 41; early, in southern Italy, 337. Bath Abbey, ii. 220. Battle Abbey, gateway at, i. 343. Battle Abbey, roll of, ii. 124. Bay-windows, i. 265. Bays, oblong, i. 57, 62; square, ii. 163, 177, 205. Beaudon, Bishop, i. 88. Beauvais, old church at, i. 41, 129, 326; basse-œuvres, ii. 12. Beddington Hall, i. 314. Bede’s description of early Irish remains, ii. 13, 21, 30, 59. Belfries, windows of, i. 161; towers of, 258. Bell-towers, i. 147; Anglo-Saxon, ii. 52. Benedictine order, ii. 33, 58. Benet’s, St., Cambridge, bell-tower, ii. 52. Beni Hassan, rock-cut tombs at, ii. 298. Bernasconi, i. 189. Bernay, Duchess Judith’s church at, ii. 14; abbey church at, 65. Bernward, Bishop, i. 43. Bertha, Queen, ii. 27. Beverley Minster, i. 200. Birinus, St., ii. 33, 104. Biscop, Benedict, works of, ii. 30, 48. Blois, St. Nicolas at, i. 196. Blois, Henry de, brother to King Stephen, founder of St. Cross, near Winchester, i. 111, 120. Bloxam’s “Principles of Gothic Architecture,” ii. 56. Bonnet-arched windows, i. 278; ii. 37, 54. Books, how to be studied from, i. 334; historical knowledge from, 334. Bosses, ii. 177, 194; in England, 195, 210. Boss-stones having the plan of the intersecting ribs drawn on them, ii. 212.