from the labors of Dr. Samuel Lee Wolff, whose contribu-
tions to the knowledge and understanding of Greene have
been of great value. To the librarians of Columbia Univer-
sity, and to Miss Jennie Craig and her assistant, Miss Olive
Paine, of the English Seminar Library of the University of
Illinois, I give my thanks for generous help. To my wife I
owe much for criticism and for preparation of the manuscript
for the press.

It is a pleasure to express my appreciation for the obliga-
tions I am under to the Department of English and Com-
parative Literature at Columbia University: to Professor
G. P. Krapp; to Professor J. B. Fletcher, who has offered
many valuable suggestions. To Professor A. H. Thorndike,
in whose mind my work had its inception, and whose counsel
and letters have aided me greatly, I feel sincere gratitude.

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