75, 115, 137, 141, 164.
scollop, see cusp.
semi-dome, 18, 27, 28, 38, 42, 73, 79, 111, 112, 115, 139;
fluted, 25, 118, 139.
serdâb, 25, 28, 35, 37, 82.
spandrel, 6, 12, 24, 27, 34, 131, 133.
spear-shaped motive, 27, 140.
spiral motive, 133.
squinch arch, 18, 23, 27, 38, 50, 51, 52, 53, 73, 79, 96, 97, 115, 140, 159;
fluted, 18.
stair, 7, 13, 20, 21, 22, 23, 28, 29, 31, 33, 34, 35, 36, 37, 40, 46, 82;
on âtesgâh, 91, 92.
staircase motive, 127.
stela, 123, 135.
stoa, 65, 124, 126.
stone, dressed, 65 n. 1, 70, 96, 124, 126, 159;
undressed masonry, 6, 24, 28, 44, 69, 76, 78, 84, 96, 113, 116, 117, 160.
stucco, 12, 16, 17, 18, 23, 24, 26, 34, 52, 86, 115, 124, 125, 134, 140, 164;
oversailing bars, 18, 26, 28, 38, 51, 65, 66, 140.
stupa, 123.
ṣuffah, 146.
symmetry, 92.

T
tabernacle in votive niches and tombs, 127.
ṭâqchah, 28, 35, 51, 52, 76.
ṭarmah, 30, 32, 48, 53, 83, 84, 87, 88, 93, 94, 119, 137, 138.
temple, Assyrian, 92, 93, 94, 124;
Babylonian, 92, 93, 94;
fire, 90, 92, 94;
in antis, 66;
peripteral, 65.
tetrapylon, 98.
theatre, at Babylon, 65;
at Ephesus, 125.
tholos, 128, 129.
torus, 76.
towers, à cheval, 103, 108;
chamber, 7, 31;
flanking, 4, 6, 7, 33, 36, 37, 41, 60, 99-110, 113, 114, 116, 117, 121, 153, 155;
in Roman camp, 99;
polygonal, 109;
rounded and rectangular, 103, 107, 108, 109;
tomb, 41 n. 1.
transept of mosque, 152, 155, 158, 159.
trifoliate apse, 117.
tubes, decoration, value of, 35, 143;
imply vault, 143;
in vault, 14, 19, 22, 30, 31, 33, 35, 36, 76, 143, 144.

U
Ukhaiḍir, absence of bath, 166;
central court, 23, 24-6, 33, 34, 82, 131;
corridor, 28, pp. 20, 23, 24, 25, 29, 33;
court A, 16, 19;
court B, 23, 30, 31, 32, 33, 82, 83;
court C, 23, 30, 32, 33, 82, 83;
court D, 23, 33;
court E, 23, 24, 30, 33, 83;
court F, 29, 33;
court G, 23, 30, 32, 33, 82, 83;
court H, 23, 30, 32, 33, 82, 83;
east annex, 34, 35, 82;
great hall (7), 12-14, 19, 24, 81;
ḥammâm, 37;
imperfect seclusion of ḥaram courts, 166;
inner walls and towers, 33;
mosque, 16-19, 150;
name of, 162;
north annex, 36, 37, 60;
north gate tower, 9, 10, 19, 21;
outer walls and gates, 4-9, 34, 78, 81;
palace yard, 5, 14, 20, 32, 33, 34;
passages 5 and 6 pp. 10, 14, 16, 34;
room 4, p. 9;
rooms 29-42, pp. 26-9, 34, 35, 82;
three-storied block, 14-23, 24, 25, 32, 33, 81, 117.
underground rooms, see serdâb.
‘uqûd, 148.

V
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.