vault, 8, 9, 10, 13, 14, 15, 16, 19, 20, 21, 22, 23, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 39, 41, 42, 48, 49, 50, 51, 72, 73, 75, 82, 83, 95, 112, 115, 143, 144, 150, 155, 160, 165, 166; at Hatra, 70-3; construction, 9, 10, 13, 14, 19, 43, 118; elliptical, _see_ (vault) ovoid; flattened, 22; groined, 29, 33, 35, 73, 97, 111, 112, 120, 166; history of, 68-70; intersection, avoided, 9, 17, 29, 53, 73; introduction of changes plan, 66; on columns, 71-2, 78; over inclined plane, 7, 16, 46, 97; oversailing, 9, 43, 45, 52, 70, 79, 118; --imitation of, 27; ovoid, 31, 52, 71, 76, 165; pointed, 45, 50, 165; pointed and oversailing, 8, 9, 14, 16, 17; segmental, 28; stilted, 13, 70; want of skill in Sasanian, 97. Via Praetoria, 98, 103, 121; Principalis, 98, 121; Quintana, 98; Sagularis, 98. Viceroys of ‘Irâq, 168. vine motive, 141. W wall, buttressed, 131; construction, 6, 38, 45; outer, angle sliced off, 39, 54; unbroken face, 126, 131. ward, 17. water basin in mosque, 151. windows in drum of dome, 79, 111. wooden beams, in wall, 6, 12, 13, 95; under vault, 9, 17, 18, 21, 32, 34, 36, 37, 39. Z ziggurat, 92. zigzag motive, 17, 27, 38, 40, 116, 140. ziyâdah, 156. ẓullah, 148, 150. INDEX OF NAMES A Abbâs, Abu, 75 n. ‘Abdeh, 103, 112. Absalom, tomb of, 128 n. Abydos, 70 n. ‘Adhrâ, the, church of, 133 n. ‘Adi ibn Zaid, 57, 59. Africa, 98 n., 110; North, 98, 99, 152. Ahwâz, Djebel, 148, 149, 160. ‘A’ishah, 146. Akbar’s mosque, 139. Akeldama, tomb of, 72. Alabanda, 128 n. Aleppo, ix, x, xi, 58, 126. Alexander, Emperor, 69, 119; his invasion, 63. Alexandria, 125, 127, 129, 152. ‘Ali, 167, 168. Alinda, walls of, 108. Alkader, _see_ el-Chader. Alyattes, tumulus of, 96. Ammân, 118 n., 140. ‘Amr ibn al-’Âṣ, 146 n., 148, 149; his mosque, 149, 150, 151. ‘Amrah, Qṣair, 56, 111, 112, 114, 118, 142, 162. Amrân mound, 65. ‘Ânah, ix. Anatolia, Central, 138. al-Anbâr, 43 n., 57 and n., 164, 167. Anderîn, 105. Andrae, Dr. Walther, v, 66 n., 69 n., 73 n., 90, 91, 92 n., 93 n., 94 n., 106 n., 107 and n., 137, 141 n., 143 n. Antioch, 57, 65, 119, 120 n., 121, 124. Anu-Adad, 93. Aosta, 109, 128, 136. Apamea, 98 n., 120 and n., 126. Aqṣâ, the, mosque of, 145, 151, 152. Arabia, vii, 127. Arabia Petraea, 98. Ardashir I., 74 n. Ardeshîr Bâbagân, 91. Argos, 96. Asarhaddon, 62, 108. al-’A’shâ, 145 n. al-’Âshiq, 86, 132 n. Asia, 65, 69, 87, 142; South-west, 126; Western, 63, 68, 123, 124, 126, 135. Asia Minor, 73, 78, 96, 108. ‘Asîleh, wells, 1. Aslâm, _see_ ‘Aṭshân. Assos, 109. Assur, 65, 66, 68, 93, 94 n., 96 n., 106 and n., 107, 140, 141 n. Assyria, 62 n., 65, 68, 74, 78, 93, 122, 123, 140, 142. al-Aswad ibn Ya’fur, 57 n. Athenaeus, 128 n. Athens, 66 n., 124. al-Athîr, Ibn, 3 n., 162 and n., 164 n. ‘Atîl, 126. ‘Atiyyah, 58. ‘Aṭshân, Khân, viii, 2, 3 and n., 40-3, 162 and n. Attalus, 124. Austria, 98.