William Adrian Bonger, the author of the work here translated, of Amsterdam, Holland, is a Dutch Publicist, a pupil of Professor Van Hamel, well known as one of the founders of the International Union of Penal Law and the most eminent of Dutch students of criminology. He was born at Amsterdam, September 6, 1876, and received the degree of Doctor in Law from the University of Amsterdam in June, 1905. The first part of the present work, which consists of a survey, with copious extracts and critical comments, of the previous literature upon the subject of the relation of crime to economic conditions is a revision of a thesis originally presented at the University. Dr. Bonger is also the author of “Religion and Crime: A Criminological Study”; Leiden, 1913, and numerous articles in Dutch and German periodicals. Among these are the following in “Nieuwe Tijd” (The New Age), a well-known Dutch socialist review: “An Apology for War”, a critical review of “Die Philosophie des Krieges” by Professor Steinmetz (1908); “Capital and Income in the Netherlands” (1910); “Marxism and Revisionism” (1910); “Crime and Socialism: A Contribution to the Study of Criminality in the Netherlands” (1911); and “Religion and Irreligion in the Netherlands” (1911). Two noteworthy contributions to “Neue Zeit” are “Cesare Lombroso” in Vol. XXVIII, number one (1910), and “Verbrechen und Sozialismus: Zugleich ein Beitrag zum Studium der Kriminalität im Deutschland” in Vol. XXX, number two (1912). In 1912 also appeared “The Social Factors of Crime and their Significance in Comparison with the Individual Causes” in Vol. XXIII of the “Tijdschrift voor Strafrecht”, the only Dutch journal of criminal law. In the first part of this work, instead of stating in his own language the views expressed in the previous literature on the subject Dr. Bonger has by extracts from the various authors given us their opinions in their own language, adding brief critical comments of his own. The second part contains Dr. Bonger’s own discussion of the phenomena of crime based upon an unusually thorough collection of statistical data and the elaboration of his views. In the selection of authors from whom he quotes Dr. Bonger shows his sympathy with the social philosophy of socialism which appears as well in the exposition of his own explanation of criminality; but the facts which he collects together with the evidence on which they rest are so explicitly set forth and his own conclusions so carefully distinguished that the value of the study is not diminished even for those who are not disposed to accept his social philosophy.