Let us begin with the first question. Truly a difficult one, and offering a multiplicity of difficulties. The first of these arises so to speak, from the nature of the sources. The doctrine of historical materialism is not embodied in a classical and definite book by those authors, with whom it is as it were identified; so that, to discuss that book and to discuss the doctrine might seem all one thing. On the contrary it is scattered through a series of writings, composed in the course of half a century, at long intervals, where only the most casual mention is made of it, and where it is sometimes merely understood or implied. Anyone who desired to reconcile all the forms with which Marx's and Engels have endowed it, would stumble upon contradictory expressions, which would make it impossible for the careful and methodical interpreter to decide what, on the whole, historical materialism meant for them.

Another difficulty arises in regard to the weight to be attached to their expressions. I do not think that there has yet been a study of what might be called Marx's forma mentis; with which Engels had something in common, partly owing to congeniality, partly owing to imitation or influence. Marx, as has been already remarked, had a kind of abhorrence for researches of purely scholastic interest. Eager for knowledge of things (I say, of concrete and individual things) he attached little weight to discussions of concepts and the forms of concepts; this sometimes degenerated into an exaggeration in his own concepts. Thus we find in him a curious opposition between statements which, interpreted strictly, are erroneous; and yet appear to us, and indeed are, loaded and pregnant with truth. Marx was addicted, in short, to a kind of concrete logic.[40] Is it best then to interpret his expressions literally, running the risk of giving them a meaning different from what they actually bore in the writer's inmost thoughts? Or is it best to interpret them broadly, running the opposite risk of giving them a meaning, theoretically perhaps more acceptable, but historically less true?

The same difficulty certainly occurs in regard to the writings of numerous thinkers; but it is especially great in regard to those of Marx. And the interpreter must proceed with caution: he must do his work bit by bit, book by book, statement by statement, connecting indeed these various indications one with another, but taking account of differences of time, of actual circumstances, of fleeting impressions, of mental and literary habits; and he must submit to acknowledge ambiguities and incompleteness where either exists, resisting the temptation to confirm and complete by his own judgment. It may be allowed for instance, as it appears to me for various reasons, that the way in which historical materialism is stated above is the same as that in which Marx and Engels understood it in their inmost thoughts; or at least that which they would have agreed to as correct if they had had more time available for such labours of scientific elaboration, and if criticism had reached them less tardily. And all this is of importance up to a certain point, for the interpreter and historian of ideas; since for the history of science, Marx and Engels are neither more nor less than they appear in their books and works; real, and not hypothetical or possible persons.[41]

But even for science itself, apart from the history of it, the hypothetical or possible Marx and Engels have their value. What concerns us theoretically is to understand the various possible ways of interpreting the problems proposed and the solutions thought out by Marx and Engels, and to select from the latter by criticism those which appear theoretically true and welcome. What was Marx's intellectual standpoint with reference to the Hegelian philosophy of history? In what consisted the criticism which he gave of it? Is the purport of this criticism always the same for instance in the article published in the Deutsch-französische Jahrbücher, for 1844, in the Heilige Familie of 1845, in the Misère de la philosophie of 1847, in the appendix to Das Komnunistische Manifest of 1848, in the preface to the Zur Kritik of 1859, and in the preface to the 2nd edition of Das Kapital of 1873? Is it again in Engels' works in the Antidühring, in the article on Feuerbach, etc.? Did Marx ever really think of substituting, as some have believed, Matter or material fact for the Hegelian Idea? And what connection was there in his mind between the concepts material and economic? Again, can the explanation given by him, of his position with regard to Hegel: 'the ideas determined by facts and not the facts by the ideas,' be called an inversion of Hegel's view, or is it not rather the inversion of that of the ideologists and doctrinaires?[42] These are some of the questions pertaining to the history of ideas, which will be answered some time or other: perhaps at present the time has not yet arrived to write the history of ideas which are still in the process of development.[43]

But, putting aside this historical curiosity, it concerns us now to work at these ideas in order to advance in theoretical knowledge. How can historical materialism justify itself scientifically? This is the question I have proposed to myself, and to which the answer is given by the critical researches referred to at the beginning of this paragraph. Without returning to them I will give other examples, taken from the same source, that of the Marxian literature. How ought we to understand scientifically Marx's neodialectic? The final opinion expressed by Engels on the subject seems to be this: the dialect is the rhythm of the development of things, i.e. the inner law of things in their development. This rhythm is not determined a priori, and by metaphysical deduction, but is rather observed and gathered a posteriori, and only through the repeated observations and verifications that are made of it in various fields of reality, can it be presupposed that all facts develop through negations, and negations of negations.[44] Thus the dialect would be the discovery of a great natural law, less empty and formal than the so-called law of evolution and it would have nothing in common with the old Hegelian dialect except the name, which would preserve for us an historical record of the way in which Marx arrived at it. But does this natural rhythm of development exist? This could only be stated from observation, to which indeed, Engels appealed in order to assert its existence. And what kind of a law is one which is revealed to us by observation? Can it ever be a law which governs things absolutely, or is it not one of those which are now called tendencies, or rather is it not merely a simple and limited generalisation? And this recognition of rhythm through negations of negations, it is not some rag of the old metaphysics, from which it may be well to free ourselves.[45] This is the investigation needed for the progress of science. In like manner should other statements of Marx and Engels be criticised. What for example shall we think of Engels' controversy with Dühring concerning the basis of history: whether this is political force or economic fact? Will it not seem to us that this controversy can perhaps retain any value in face of Dühring's assertion that political fact is that which is essential historically, but in itself has not that general importance which it is proposed to ascribe to it? We may reflect for a moment that Engels' thesis: 'force protects (schützt) but does not cause (verursacht) usurpation,' might be directly inverted into another that: 'force causes usurpation, but economic interest protects it,' and this by the well known principle of the inter-dependence and competition of the social factors.

And the class war? In what sense is the general statement true that history is a class war? I should be inclined to say that history is a class war (1) when there are classes, (2) when they have antagonistic interests, (3) when they are aware of this antagonism, which would give us, in the main, the humourous equivalence that history is a class war only when it is a class war. In fact sometimes classes have not had antagonistic interests, and very often they are not conscious of them; of which the socialists are well aware when they endeavour, by efforts not always crowned with success (with the peasantry, for example, they have not yet succeeded), to arouse this consciousness in the modern proletariat. As to the possibility of the non-existence of classes, the socialists who prophesy this non-existence for the society of the future, must at least admit that it is not a matter intrinsically necessary to historical development, since in the future, and without classes, history, it may well be hoped will continue. In short even the particular statement that 'history is a class war,' has that limited value of a canon and of a point of view, which we have allowed in general to the materialist conception.[46]

The second of the two questions proposed at the beginning is: How do the Marxians understand historical materialism? To me it seems undeniable that in the Marxian literature, i.e. the writings of the followers and interpreters of Marx, there exists in truth a metaphysical danger of which it is necessary to beware. Even in the writings of Professor Labriola some statements are met with which have recently led a careful and accurate critic to conclude that Labriola understands historical materialism in the genuine and original sense of a metaphysic, and that of the worst kind, a metaphysic of the contingent.[47] But although I have myself, on another occasion, pointed out those statements and formulae which seem to me doubtful in Labriola's writings, I still think, as I thought then, that they are superficial outgrowths on a system of thought essentially sound; or to speak in a manner agreeing with the considerations developed above, that Labriola, having educated himself in Marxism, may have borrowed from it also some of its over-absolute style, and at times a certain carelessness about the working out of concepts, which are somewhat surprising in an old Herbartian like himself,[48] but which he then corrects by observations and limitations always useful, even if slightly contradictory, because they bring us back to the ground of reality.

Labriola, moreover, has a special merit, which marks him off from the ordinary exponents and adapters of historical materialism. Although his theoretical formulae may here and there expose him to criticism, when he turns to history, i.e. to concrete facts, he changes his attitude, throws off as it were, the burden of theory and becomes cautious and circumspect: he possesses, in a high degree, respect for history. He shows unceasingly his dislike for formulae of every kind, when concerned to establish and scrutinise definite processes, nor does he forget to give the warning that there exists 'no theory, however good and excellent in itself, which will help us to a summary knowledge of every historical detail.'[49]

In his last book we may note especially a full inquiry into what could possibly be the nature of a history of Christianity. Labriola criticises those who set up as an historical subject the essence of Christianity, of which it is unknown where or when it has existed; since the history of the last centuries of the Roman Empire shows us merely the origin and growth of what constituted the Christian society, or the church, a varying group of facts amidst varied historical conditions. This critical opinion held by Labriola seems to me perfectly correct; since it is not meant to deny, (what I myself, do not deny) the justification of that method of historical exposition, which for lack of another phrase, I once called histories by concepts,[50] thus distinguishing it from the historical exposition of the life of a given social group in a given place and during a given period of time. He who writes the history of Christianity, claims in truth, to accomplish a task somewhat similar to the tasks of the historians of literature, of philosophy, of art: i.e. to isolate a body of facts which enter into a fixed concept, and to arrange them in a chronological series, without however denying or ignoring the source which these facts have in the other facts of life, but keeping them apart for the convenience of more detailed consideration. The worst of it is that whereas literature, philosophy, art and so on are determined or determinable concepts, Christianity is almost solely a bond, which unites beliefs often intrinsically very diverse; and, in writing the history of Christianity, there is often a danger of writing in reality the history of a name, void without substance.[51]

But what would Labriola say if his cautious criticism were turned against that history of the origin of the family, of private property and of class distinctions, which is one of the most extensive historical applications made by the followers of Marx: desired by Marx, sketched out by Engels on the lines of Morgan's investigations, carried on by others. Alas, in this matter, the aim was not merely to write, as could, perhaps, have been done, a useful manual of the historical facts which enter into these three concepts, but actually an additional history was produced: A history, to use Labriola's own phrase, of the essence family, of the essence class and of the essence private property, with a predetermined cadence. A 'history of the family,' to confine ourselves to one of the three groups of facts,—can only be an enumeration and description of the particular forms taken by the family amongst different races and in the course of time: a series of particular histories, which unite themselves into a general concept. It is this which is offered by Morgan's theories, expounded by Engels, which theories modern criticism have cut away on all sides.[52] Have they not allowed themselves to presuppose, as an historical stage, through which all races are fated to pass, that chimerical matriarchate, in which the mere reckoning of descent through the mother is confused with the predominance of woman in the family and that of woman in society? Have we not seen the reproofs and even the jeers directed by some Marxians against those cautious historians who deny that it is possible to assert, in the present condition of the criticism of sources, the existence of a primitive communism, or a matriarchate, amongst the Hellenic races? Indeed, I do not think that throughout this investigation proof has been given of much critical foresight.