The eminent scholar and author in his preface to the American edition expresses the conviction that his “ideas about the etiology of crime will not be shared by a great many readers of the American edition,” and, also, “that the book is sure to meet with many disapproving critics on this side of the ocean.” The distinguished author may be agreeably disappointed in the number of American readers who will agree in a large measure with his conclusions as to the causes of crime generally. I am inclined to think that the remedy which Dr. Bonger proposes is more apt to elicit controversy than the correctness of his diagnosis. The great value of Dr. Bonger’s work to Americans, however, will be independent of the number of readers who concede the force of his reasoning or accept the logic of his conclusions. Disagree with the author’s conclusions as the reader may and its value to the reader will not be impaired. One cannot take issue with the conclusions of a scholar based on study and research, without an exercise of processes of the mind valuable to the reader, and probably so to others. From the right quantity and quality of criticism comes the truth. One of the most valuable portions of Dr. Bonger’s work will be found in his own criticisms of the writings of other European authors, particularly those comprising the so-called Italian and French schools. “Criminality and Economic Conditions” is the nearest approach to an exhaustive treatment of the question of the agencies productive of crime which has thus far been published in this country. The work is a result of great study and research, and little existing data can have been overlooked. Agree or not with the conclusions of the author, doubt the force of his reasoning if one will, nevertheless, such reasoning and conclusions have their basis in statistics and data furnished, from which other reasoning or conclusions may be formed if the reader thinks the author’s conclusions are not supported by the facts. Whether existing economic conditions are fundamentally wrong, and crime is but the natural concomitant of a false economic basis upon which society is organized, is a controversial question which is so forcefully presented by the author that the reader must concede that his views have been presented by a master.