crime to take into consideration that in some European countries the beginning of the rise of the lower classes, who form the greatest contingent of criminals, has been sufficient to arrest the increase of crime, even in many cases to occasion a decrease. My book will thus be sure to meet with many disapproving critics on the other side of the ocean. I fear them not. If only facts are opposed to facts, truth will come to light. “Du choc des opinions jaillit la vérité!” According to my undertaking I have stated in notes the principal literature of the latest years. In concert with the desire of the Committee I have shortened the text as much as possible. The whole passage about “race and crime” I have omitted because—maintaining in general what I had written about it—I now have much more to say on the subject, but the space therefor was not at my disposition. For the same reason I left the passage on “Physical Environment and Crime” as it was. The treatment in detail of both these questions will take place in due time elsewhere. I will not close this preface without assuring the Committee on Translations how highly I value their broad view and large-minded resolution to give a hearing to one whose opinions differ so much from the usual. To my translator, my hearty thanks for the good care bestowed on my book. W. A. Bonger. Amsterdam, June, 1914. THE AUTHOR’S PREFACE TO THE ORIGINAL EDITION. Honorable mention has been given to the first part of this work, which was written upon a subject proposed by the juridical faculty of the University of Amsterdam, and entitled “A Systematic and Critical Exposition of the Literature Dealing with the Relation between Criminality and Economic Conditions.” To this exposition I have added the opinions of some additional authors, and have treated some others more fully than in the original; but on the whole this part of the work has been little changed. The second part, on the other hand, is almost entirely new; though it is true that in my thesis I had already marked out a line of investigation which, in my opinion, required a profound study of the relation between criminality and economic conditions. The period of one year fixed by the faculty was too limited a time in which to give more than a brief survey of the question. I have left the exposition as it was without restating it in the second part (now the more important division of the work), although I am aware that objections might be made, especially as to the form. However, I have not felt that these are of sufficient importance to demand a complete recasting of the work. I take advantage of this opportunity to express my sincere thanks to those who have expressed their good will by lending me their aid; especially to my highly esteemed colleague, Professor G. A. van Hamel, and my friends Dr. A. Aletrino and N. W. Posthumus. Amsterdam, February, 1905.