Bk. VI. Ch III. VAULTS. 149 squares than was otherwise attainable ; hut it is most false in prin- ciple, and, in spite of all its beauty of detail, cannot be considered successful. Strange as it may appear from its date, the most satisfactory roof of this class is that erected by Cardinal Wolsey in the beginning of 582. Ketro-cUcjir, Peterborough Cathearal. (Oath. Hb.) the 16th century over the choir of Oxford Cathedral. In this instance the pendants are thrust so far forward and made so important that the central part of the roof is practically quadripartite. The remaining difficulty was obviated by abandoning the circular horizontal outline of true fan-tracery, and adopting a polygonal form instead. As the whole is done in a constructive manner and with appropriate detail,
