^RAf> 



JUL 



^^6-v cf ^v.^^^ 



COPYRIGHT, 191 8, BY 

 YALE UNIVERSITY PRESS 



First published^ igi8. 

 Second printings ^9^9' 



Third printings 1^20. 

 Fourth printings 1^22. 



Fifth printings 1923- 



0^ 

 €01 



