Historical science has, then, as its first and principal object the determination and the investigation of this artificial foundation, its origin, its composition, its changes and its transformations. To say that all this is only a part and a prolongation of nature, is to say a thing which by its too abstract and too generic character has no longer any meaning.
The human race, in fact, lives only in earthly conditions, and we cannot suppose it to be transplanted elsewhere. Under these conditions it has found from its very first beginnings down to the present day the immediate means necessary for the development of labor, that is to say, for its material progress as for its inner formation. These natural conditions were and they are always indispensable to the sporadic agriculture of the nomads, who sometimes cultivated the earth merely for the pasturage of animals, as well as for the refined products of intensive modern horticulture. These earthly conditions, precisely as they have furnished the different sorts of stones suited for the fabrication of the first weapons, furnish now also, with coal, the elements of the great industry; precisely as they gave the first laborers osiers and willows to plait, they give now all the materials necessary to the complicated technique of electricity.
It is not, however, the natural materials themselves which have progressed. On the contrary, it is only men who progress, through discovering little by little in nature the conditions which permit them to produce in more and more complex forms, thanks to the labor accumulated in experience. This progress does not consist merely in the sort of progress with which subjective psychology is concerned that is to say, the inner modifications which would be the proper and direct development of the intellect, the reasoning and the thought. Moreover, this inner progress is but a secondary and derived product, in proportion as there is already a progress realized in the artificial foundation which is the sum of the social relations resulting from the forms and the distributions of labor. It is, then, a meaningless affirmation to say that all this is but a simple prolongation of nature, unless one wishes to employ this word in so generic a sense that it no longer indicates anything precise and distinct; that which is not realized by the work of man.