Since it has been my privilege in these first pages simply to rebut these prejudices (in a preliminary fashion) and unmask the intentions and the tendencies underlying them, it must be remembered that the meaning of this doctrine ought, before all else, to be drawn from the position which it takes and occupies with regard to the doctrines against which it is in reality opposed, and particularly with regard to the ideologies of every sort;--that the proof of its value consists exclusively in the more suitable and more appropriate explanation of the succession of human events which is derived from it;--that this doctrine does not imply a subjective preference for a certain quality or a certain sum of human interests opposed by free choice to other interests, but that it merely affirms the objective co-ordination and subordination of all interests in the development of all society; and this it affirms, thanks to that genetic _processus_ which consists in going from the conditions to the conditioned, from the elements of formation to the things formed. Let the verbalists reason as they like over the value of the word _matter_ in so far as it implies or recalls a metaphysical conception, or in so far as it is the expression of the last hypothetical substratum of experience. We are not here in the domain of physics, chemistry or biology; we are only searching for the explicit conditions of human association in so far as it is no longer simply animal. It is not for us to support our inductions or our deductions upon the data of biology, but, on the contrary, to recognize before all else the peculiarities of human association, which form and develop through the succession and the growing perfection of the activity of man himself in given and variable conditions, and to find the relations of co-ordination and subordination of the needs which are the substratum of will and action. It is not proposed to discover an intention nor to formulate a criticism; it is merely the necessity arising from the facts that must be put in evidence. And as men, not by free choice, but because they could not act otherwise, satisfy first certain elementary needs, which, in their turn, give rise to others in their upward development, and as for the satisfaction of their needs, whatever they may be, they invent and employ certain means and certain tools and associate themselves in certain definite fashions, the materialism of historical interpretation is nothing else than an attempt to reconstruct by thought with method the genesis and the complexity of the social life which develops through the ages. The novelty of this doctrine does not differ from that of all the other doctrines which after many excursions through the domains of the imagination have finally arrived, very painfully, at reaching the prose of reality and halting there. II.