



- 





PREFACE 



b- 



THE manuscript of these lectures was found amongst 

 my husband's papers. He had, I know, intended to 

 publish them, but had laid them aside to await final 

 revision before going to press. In these circumstances 

 the best course seemed to be to publish the text 

 exactly as he had left it, while adding a few illustra- 

 tions to take the place of the lantern slides used at 

 the lectures when these were delivered at University 

 College, London. 



I am glad to have the opportunity of acknowledging 

 here my deep indebtedness to all who have so kindly 

 helped me in seeing this book through the Press. My 

 thanks are especially due to Miss Kirkaldy, to Mrs. 

 Cuthbert Baines, to Dr. Marett, to Professor Ramsay 

 Wright, and to the Delegates of the University Press, 

 who one and all by their valuable help and kindly 

 sympathy have made it possible for me to carry out 

 one of my husband's last wishes. 



CONSTANCE JENKINSON. 



OXFORD. 



