INTRODUCTION 



Care has been exercised in the giving of 

 full credit for data and quotations, even at 

 the expense of good diction. The author 

 also wishes to acknowledge, herewith, his 

 indebtedness to all persons who have con- 

 tributed to the work by the answering of 

 questions, the loan of books and records of 

 all descriptions, and by their enthusiastic 

 support and encouragement; he is especially 

 indebted to Prof. George M. Dutcher, PH.D., 

 of Wesleyan University, for a criticism of 

 the manuscript and for many valuable sug- 

 gestions. 



J. R. S. 



