But, with all deference to Professor Stammler, we believe that these _trifling matters_, to which he contemptuously refers, are precisely what are dealt with in Marx's propositions; and, moreover, we think them neither so trifling nor of such little consequence. Hence Professor Stammler's book does not appear to us a criticism of the most vital part of historical materialism, viz., of a movement or school of historians. The criticism of history is made by history; and historical materialism is history made or _in the making_. Nor does it provide the starting point for a criticism of _socialism_, as the programme of a definite social movement. Stammler deceives himself when he thinks that socialism is based on the materialistic philosophy of history as he expounds it: on which philosophy are based, on the contrary, the illusions and caprices of some or of many socialists. Socialism cannot depend on an abstract sociological theory, since the basis would be inadequate precisely because it was abstract; nor can it depend on a philosophy of history as rhythmical or of little stability, because the basis would be transitory. On the contrary, it is a complex fact and results from different elements; and, so far as concerns history, socialism does not presuppose a _philosophy of history_, but _an historical conception determined by the existing conditions of society and the manner in which this has come about_. If we put on one side the doctrines superimposed subsequently, and read again Marx's pages without prejudice, we shall then see that he had, at bottom, no other meaning when he referred to history as one of the factors justifying socialism. 'The necessity for the socialisation of the means of production is not proved scientifically.' Stammler means that the concept of _necessity_ as employed by many Marxians, is erroneous; that the denial of teleology is absurd, and that hence the assertion of the socialisation of the means of production as the social programme is not logically accounted for. This does not hinder this assertion from being possibly quite true. Either because, in addition to logical demonstrations there are fortunate intuitions, or because a conclusion can be true although derived from a false premiss: it suffices, obviously, that there should be two errors which cancel one another. And this would be so in our case. The denial of teleology; the tacit acceptance of this same teleology: here is a method scientifically incorrect with a conclusion that may be valid. It remains to examine the whole tissue of experiences, deductions, aspirations and forecasts in which socialism really consists; and over which Stammler passes indifferently, content to have brought to light an error in the philosophical statement of a remote postulate, an error which some, or it may be many, of the supporters and politicians of socialism commit.