'X\. ^^^^l -"^^a^ \ ^ 

 Note. — The parts of this work appeared as follows :- 



Part I., yth November, 1919 ; 



Part II., 5th January, 1920 ; 



Part III., 25th March, 1920 



Part IV., 27th May, 1920 ; 



Part v., 1st July, 1920 ; and 



Part VI., 1st September, 1920. 



