It is unnecessary for us to linger over this point. Professor Loria has stated the theory inaccurately, and Professor Ferri, who has depended upon Loria, combats something that Marx never said, and thinks that he has discovered the further error that account is not taken of the fact that each cause is in its turn an effect, and vice versa. This too it is an injustice to impute to the founders of historic materialism. Engels says upon this subject: “... according to the materialistic conception of history, production and reproduction of the material life are, in the last analysis, the determining factors in history. Marx and I have never claimed more. When the proposition is distorted thus: the economic factor is the sole determinant, the proposition is transformed into one devoid of sense, abstract, absurd. The economic situation is the basis, but the different factors of the superstructure—political forms of the struggle of the classes and its results—constitutions imposed by the victorious class after the battle has been won, etc.—juridical forms, and also the reflections of all these actual conflicts in the minds of those who have taken part in them, political, juridical, and philosophical theories, religious conceptions, and their ulterior development into systems of dogmas, have also their influence upon the march of the historic struggles, and especially in many cases determine the form of it. All these factors act the one upon the other, and finally the economic movement ends necessarily by dominating over the infinite crowd of chances.... Without this the application of the theory to any historic period would be easier than the solution of a simple equation of the second degree.” [126]