This leads me back once more to the Qaṣr of Muqâtil, which, though it was in existence during the pre-Mohammadan and Umayyad periods, was destroyed and rebuilt by ‘Îsâ ibn ‘Ali; and without insisting upon the identity of the two, I submit that the suggestion that they may be identical is not groundless. The well in the Wâdi al-Ubaiḍ is the only spot in the region immediately south of the lake of Abû Dibs at which fresh water can be obtained, and for that reason it was probably always frequented. That no advantage should have been taken of it at a time when Ḥîrah and Kûfah were rich and important centres of population is difficult to suppose. But whatever habitation was in existence on the Wâdi al-Ubaiḍ during the Days of Ignorance, it cannot have been the same as the palace of Ukhaiḍir, which is indisputably of Mohammadan origin. The Qaṣr al-Muqâtil was, however, rebuilt in the early part of the Abbâsid era; and that is a date (and as I have attempted to show, it is the latest date) which is consistent with the architecture of Ukhaiḍir. SUBJECT INDEX A abacus, 12, 29; boss on, 135. acanthus, 141, n. 3. acroterion, 129. aedicula, 127, 129, 139. aisle of mosque, 151, 152, 153, 154, 157, 158, 159. aiwân, _see_ lîwân. Alexandrian influence, 126, 127, 136. ancient road, Kûfah-Shethâthâ, 2, 43. antechamber, _see_ ṭarmah. apadana, 63. arcade, 16, 17, 19, 23, 28, 30, 32, 35, 49, 50, 71, 125, 153, 154, 155, 156, 159; blind, 5, 6, 24, 25, 30, 32, 34. arch, breaking into vault, 10, 20, 34; construction, 6, 12, 15, 18, 24, 26, 29, 39, 42, 113, 166; decoration, 122; horse-shoed, 8, 24, 165, 166; ogee, 40; oversailing, 9, 15, 16, 26, 27, 33, 79, 115; ovoid, 6, 26, 28, 32, 33, 34, 114; pointed, 5, 6, 9, 16, 29, 32, 34, 112, 114, 118, 165; relieving, 112, 113, 115, 118; round, 30, 39, 41, 43, 76, 112, 113, 115, 118, 165; segmental, 13; set back from jambs, 14, 16, 20, 25, 26, 28, 33, 76, 79, 118, 166; stilted, 8, 29, 114, 118; transition from round or ovoid to pointed, 114, 165; transverse, 8, 9, 17, 18, 26, 27, 28, 29, 30, 33, 36, 37, 51, 53, 72, 73, 83, 96, 97, 112, 115, 140. architrave, 123, 131, 135, 136; broken, 125, 128. archivolt, 128, 129, 131, 133, 135. armamentarium, 102, 103. Assyro-Babylonian influence, 142, 164. asymmetry, 51, 52, 79, 81, 93, 94; in façade, 130, 131, 132. âteshgâh, 91, 92. attic, 127, 128, 129, 130. B bâdiyah, 55, 112, 119. bait, 82, 83, 84, 86, 87, 88, 89, 104, 105, 106, 112, 113, 114, 116, 117, 118, 120. balcony, 19, 23, 25, 133. barracks, in Roman camp, 100, 102, 105. base, absence of, 27, 42, 134; bell-shaped, 156. bastion, 107, 108. bath, _see_ ḥammâm. battering-ram, 107. brackets, horizontal, under domes, semi-domes, and calottes, 9, 10, 12, 15, 18, 24, 25, 27, 42, 73, 97, 111, 112, 113.