Oxford University Press, Amen House, London E.C. 4 



GLASGOW NEW YORK TORONTO MELBOURNE WELLINGTON 

 BOMBAY CALCUTTA MADRAS CAPE TOWN 



Geoffrey Curnberlege, Publisher to the University 



FIRST PUBLISHED 1920 

 REPRINTED 1925. 1935. 1946. 1952 



PRINTED IK GREAT BRITAIN 



