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anyone else, the publication of this volume is due; and to his colleagues, Professors Leon C. Marshall and Harold G. Moulton, of the University of Chicago, who have made many valuable suggestions about subject-matter and the arrangement of the material, His obligations to various publishers, who have generously permitted the use of much valuable copyrighted material, are expressed in detail in the bibliographical footnotes.

W. H. H.
UNIVERSITY OF CHICAGO

August 19, 1915

TABLE OF CONTENTS

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Introduction

I

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31

32

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33
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I 20

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