Thirteenth in the UNESCO World Art Series, this was prepared in cooperation with the Greek National Commission for UNESCO and various Ministries. The introductory material provides some factual background for the 32 full color plates, clarifying the scope of the volume, the high artistic quality of Byzantine mosaics, their adaptation to the architecture, and the reasons for the survivals despite the vicissitudes, invasions and transformation of early Christian shrines into Turkish mosques. It is a fascinating glimpse into the archeological discoveries and the loving work of restoration. The material belongs in the larger pattern of Byzantine art and should really be studied along with D. T. Rice's The Art of Byzantium (Abrams) reviewed on p. 133 and with Forlati & Tesca's Mosaics of St. Mark (N.Y. Graphic- 1958- reviewed on p. 742 of that year). The colored reproductions -- for the greater part (there are a few exceptions) are superbly reproduced and capture the brilliance of the originals from the V to XIV centuries.