PREFACE 



JTHHE preparation of this volume has been 

 a work of particular pleasure: First, 

 because of the unusual interest which has 

 centered in the development of the material, 

 material which takes its rise in primal places 

 and flows in a broad stream outward; and, 

 second, and paramount, it has been a pleasure 

 because of the contact it has brought with 

 the man whose life and achievements it can 

 but inadequately portray. 



When the demands of his great work have 

 been most exacting, he has never shrunk from 

 giving still more of his strength to the illumi- 

 nation of obscure points ; when the work has 

 worn upon him so that it has taxed his 

 energies to the utmost, while care sought out 

 the strings of his nerves to play sharp discords 

 upon them, he has never failed in patience or 



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