of all the tools of production and the means of life but in every period of prosperity (Schwindelperiode) and in each succeeding panic shows that it is incapable of controlling in the future the growing productive forces; a class under whose leadership society runs headlong to ruin like a locomotive whose closed safety valve the engine driver is too weak to open. In other words it has come about that the productive forces of the modern capitalistic mode of production as well as the system of distribution based upon it are in glaring contradiction to the mode of production itself and to such a degree that a revolution in the modes of production and distribution must take place which will abolish all class differences or the whole of modern society will fall. It is in these actual material facts, which are necessarily becoming more and more evident to the exploited proletariat, that the confidence in the victory of modern socialism finds its foundation and not in this or that bookworm's notions of justice and injustice. _II. The Force Theory._ (Herr Duehring argues that the causes of class subjection are to be sought in political conditions and that political force is the primary, and economic conditions merely the secondary, cause of class distinctions Engels makes the following reply to these arguments): * * * * * This is Herr Duehring's theory. It is set out, decreed so to say, here and in several other places. But we cannot find the slightest attempt to prove it or to disprove the opposite theory in the three thick volumes. Moreover if there was an abundance of proof we should get none from Herr Duehring, for the matter is proven by the famous fall of man in that Robinson Crusoe made Friday his slave. That was an act of force and so a political act. And this slavery constitutes the point of departure and fundamental fact of history up to the present time and inoculates the heirs of sin with injustice so certainly that only lately it has become milder and "transformed into the more indirect forms of economic dependency." Since the whole of the remaining actual "force-possession" rests upon this original enslavement, it is clear that all economic phenomena can be explained from original political causes, that is from force. And whoever is not satisfied with this is a secret reactionary. Let us first remark that one has to be as much in love with himself as Herr Duehring is to consider this idea as "original" since it is not so by any means. The idea that the political doings of monarch and states are decisive events in history is as old as the writing of history itself and is the reason why we are so little aware of the real and quietly developing progress of the peoples which goes on behind these noisy and spectacular activities. This idea has dominated the whole of history in the past and got its first shock at the hands of the French bourgeois historians of the Restoration period.