PREFACE TO THE THIRD 

 EDITION 



Only minor additions and corrections have been made in 

 the text of this edition, but it contains a number of new 

 illustrations in the form of plates. For some of these I 

 am indebted to t the able pencils of Messrs. L. D. Sayers, 

 W. Thornton Shiells, and W. West; for others I have to 

 make acknowledgment to Messrs. Cassell & Co. Ltd., 

 Longmans, Green, & Co., Macmillan & Co. Ltd., and 

 Kegan Paul, Trench, Triibner, & Co. Ltd. 



L. A. BOREADAILE. 



Sblwyn College, Cambridge, 

 October 191 9. 



