Finally the editors are bound to express their indebtedness to the writers and publishers who have granted their permission to use the materials from which this volume has been put together. Without the use of these materials it would not have been possible to exhibit the many and varied types of observation and reflection which have contributed to present-day knowledge of social life. In order to give this volume a systematic character it has been necessary to tear these excerpts from their contexts and to put them, sometimes, into strange categories. In doing this it will no doubt have happened that some false impressions have been created. This was perhaps inevitable and to be expected. On the other hand these brief excerpts offered here will serve, it is hoped, as an introduction to the works from which they have been taken, and, together with the bibliographies which accompany them, will serve further to direct and stimulate the reading and research of students. The co-operation of the following publishers, organizations and journals, in giving, by special arrangement, permission to use selections from copyright material, was therefore distinctly appreciated by the editors: D. Appleton & Co.; G. Bell & Sons; J. F. Bergmann; Columbia University Press; George H. Doran Co.; Duncker und Humblot; Duffield & Co.; Encyclopedia Americana Corporation; M. Giard et Cie; Ginn & Co.; Harcourt, Brace & Co.; Paul B. Hoeber; Houghton Mifflin Co.; Henry Holt & Co.; B. W. Huebsch; P. S. King & Son; T. W. Laurie, Ltd.; Longmans, Green & Co.; John W. Luce & Co.; The Macmillan Co.; A. C. McClurg & Co.; Methuen & Co.; John Murray; Martinus Nijhoff; Open Court Publishing Co.; Oxford University Press; G. P. Putnam's Sons; Rütten und Loening; Charles Scribner's Sons; Frederick A. Stokes & Co.; W. Thacker & Co.; University of Chicago Press; University Tutorial Press, Ltd.; Wagnerische Univ. Buchhandlung; Walter Scott Publishing Co.; Williams & Norgate; Yale University Press; American Association for International Conciliation; American Economic Association; American Sociological Society; Carnegie Institution of Washington; _American Journal of Psychology_; _American Journal of Sociology_; _Cornhill Magazine_; _International Journal of Ethics_; _Journal of Abnormal Psychology_; _Journal of Delinquency_; _Nature_; _Pedagogical Seminary_; _Popular Science Monthly_; _Religious Education_; _Scientific Monthly_; _Sociological Review_; _World's Work_; _Yale Review_. CHICAGO June 18, 1921 TABLE OF CONTENTS CHAPTER I. SOCIOLOGY AND THE SOCIAL SCIENCES PAGE I. Sociology and "Scientific" History 1 II. Historical and Sociological Facts 6 III. Human Nature and Law 12 IV. History, Natural History, and Sociology 16