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PREFATORY NOTE
The author desires to acknowledge with gratitude his indebtedness to Mr S. A. Cook for his kindness in reading the first proofs and in making many most valuable suggestions and criticisms, and to the General Editor of the Series, the Dean of Ely, for his very helpful revision of the proofs. His obligation to Professor W. E. Barnes is referred to on p. lx.
W. A. L. E.
