PREFACE

I take this occasion to acknowledge my great debt to Professor
F. F. Abbott of Princeton University. At his suggestion, I under¬
took this investigation, and, during the course of my work upon it,
his advice and criticism have been invaluable. I desire to express
my deep gratitude also to Professor Edward Capps and Professor
D. R. Stuart, both of Princeton University, for their helpfulness and
interest in my work.

S. G. H.

Eureka College,
Eureka, Illinois.
 

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