PREFACE 
jl Dieses 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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