[Illustration: FIG. 1. Chehâr Qapû, interior of east gate.] [Illustration: FIG. 2. Chehâr Qapû, niche in room 8.] [Illustration: FIG. 3. Chehâr Qapû, squinch in room 6.] PLATE 66 [Illustration: FIG. 1. Chehâr Qapû, niche in room 6.] [Illustration: FIG. 2. Chehâr Qapû, squinch in room 14.] PLATE 67 [Illustration: Chehâr Qapû, court D and hall 54, from east.] PLATE 68 [Illustration: FIG. 1. Chehâr Qapû, vault of room 31.] [Illustration: FIG. 2. Chehâr Qapû, squinch in room 39.] PLATE 69 [Illustration: FIG. 1. Chehâr Qapû, hall 54, south-east corner.] [Illustration: FIG. 2. Chehâr Qapû, hall 54, squinch in south-west corner.] PLATE 70 [Illustration: FIG. 1. Chehâr Qapû, hall 54, exterior of south door.] [Illustration: FIG. 2. Chehâr Qapû, hall 54, interior of south door.] PLATE 71 [Illustration: Chehâr Qapû, hall 54, from south.] PLATE 72 [Illustration: Chehâr Qapû, hall 54, from west.] PLATE 73 [Illustration: FIG. 1. Qaṣr-i-Shîrîn, Qal’a-i-Khusrau. (_From M. de Morgan’s ‘Mission scientifique en Perse’._)] [Illustration: FIG. 2. Firûzâbâd. (_From ‘Voyage en Perse’: Flandin & Coste._)] PLATE 74 [Illustration: FIG. 1. Sarvistân, small domed chamber. (_From L’Art antique de la Perse’, by kind permission of M. Dieulafoy._)] [Illustration: FIG. 2. Hatra, oversailing vault in main palace.] PLATE 75 [Illustration: FIG. 1. Kerkûk, Mâr Ṭahmâsgerd.] [Illustration: FIG. 2. Hatra, vaulted passage in so-called temple.] PLATE 76 [Illustration: Sarvistân (_From ‘Voyage en Perse’: Flandin & Coste._)] PLATE 77 [Illustration: Sargon’s Palace at Khorsâbâd. (_From ‘Ninive’: Place._)] PLATE 78 [Illustration: FIG. 1. Gate at Khorsâbâd. (_From ‘Ninive’: Place._)] [Illustration: FIG. 2. Ḍumair. (_From ‘Provincia Arabia’, by kind permission of Professor Brünnow._)] PLATE 79 [Illustration: FIG. 1. Kharâneh. (_Phot. by Dr. Moritz._)] [Illustration: FIG. 2. Kharâneh, gateway. (_Phot. by Dr. Moritz._)] PLATE 80 [Illustration: FIG. 1. Kharâneh, interior of court. (_Phot. by Dr. Moritz._)] [Illustration: FIG. 2. Kharâneh, interior of audience hall. (_Phot. by Dr. Moritz._)] PLATE 81 [Illustration: Mshattâ. (_From ‘Mschattâ’, by kind permission of Professor Strzygowski._)] PLATE 82 [Illustration: FIG. 1. Petra, Corinthian tomb.] [Illustration: FIG. 2. Petra, al-Dair.] PLATE 83 [Illustration: Ctesiphon. (_From ‘L’Art antique de la Perse’, by kind permission of M. Dieulafoy._)] PLATE 84 [Illustration: FIG. 1. Doorway of mosque, Ḥasan Kaif.] [Illustration: FIG. 2. Gateway of mosque, Ḥarrân.] [Illustration: FIG. 3. Mayâfârqin, north façade of mosque.] PLATE 85 [Illustration: Ukhaiḍir, reconstructed north façade of central court.] PLATE 86 [Illustration: FIG. 1. Parthian decoration, Assur.] [Illustration: FIG. 2. Sasanian silver dish (Hermitage, St. Petersburg, No. 2969). (_Phot. F. Bruckmann A.-G., Munich._)] PLATE 87 [Illustration: Details of decoration from Medînat al-Zahrâ.