Third. An examination of historic criminality is very interesting; that of our own day is still more so. However, social science is not simply a means of solving interesting problems, but also, and chiefly, a means of pointing out to society the way to protect itself from scourges like criminality, or if possible, to get rid of them entirely. Here the saying of Marx applies: “The philosophers have only interpreted the world differently; the important thing is to alter it.”


Above I have already remarked that some authors have an opinion that differs from that of the majority, and are in agreement with the theory cited. Among these must be cited Engels, one of the two founders of this theory, and most of the authors of whom I spoke in the last chapter. However, Engels has only made, in passing, some observations upon the influence of capitalism on crime among the [[246]]workers in factories; Hirsch, in his interesting brochure, has pointed out only certain sides of the economic life; and although the studies concerning this question published by Lafargue and by Lux are more complete than those of the first two authors, there are nevertheless important points which these last have not examined, or to the bottom of which they have not gone, as it seems to me. And it is quite comprehensible that it should be so; for the work of Lafargue is only a magazine article, and that of Dr. Lux is one of the subdivisions of a social-political manual, in which he treats of crime among other social phenomena. The works of the other authors noticed in Chapter VII, do not make the study of the question in the manner noted, useless.

I am of the opinion, then, that while the works quoted have made considerable progress, there is still much to be done. It therefore appears to me that it will not be without profit to take up the subject.


The theory of Marx and Engels results in our having a method of investigation already marked out. While most authors who have published studies upon the question, have thought it unnecessary to give an exposition of the economic system in which we live, or perhaps have given a little attention to it along with other social conditions, I shall begin by setting forth the present economic system as that upon which the other parts of the social life rest. These I shall treat in their turn, in so far as they are connected with criminality. It is obvious that this will be only a sketch, for if one wished all the details, it would be enough to refer to the special literature upon the subject. Then I shall investigate the question of how far criminality, under its different forms, is the consequence of the conditions we have found.

[Note to the American Edition: According to some criticisms of my book it should have been my task not only to give a sketch of the economic theory of Marx, but also to prove it “in extenso” and to refute the criticisms of it, since it is not universally accepted.

It is true that this theory has not been generally accepted—a thing that would be impossible from the social consequences of such acceptation—but I claim that of all the economic theories, that of Marx is the only one that daily wins more adherents, and more and more interpenetrates all social science—even in the case of authors who are the bitterest opponents of this theory.

To require that a book like mine should once more set forth and defend the theory of Marx “in extenso”, is as impossible as to require that a modern biologist, who proceeds upon the basis of the Darwinian theory, should prove over again that his basis is sound. That there may be more or less error in detail in the theory of Marx, as in that of Darwin, is possible, but in general they have resisted, like a wall of bronze, all attacks in the most pitiless of contests, that of opinions.

Let the adversaries of Marx’s theory judge without prejudice whether that theory does not constitute a great step in advance in criminology!] [[247]]