In the third place, as I have said, men living socially, do not cease to live also in nature. They are not, of course, bound to nature as animals are, because they live on an artificial groundwork. Every one understands, moreover, that a house is not a cave, that agriculture is not natural pasturage, and that pharmacy is not exorcism. But nature is always the immediate subsoil of the artificial groundwork, and it is the environment which contains us. The industrial arts have put between us social animals, and nature, certain intermediaries which modify, set aside or remove the natural influences; but it has not for all that destroyed the efficacy of these, and we continually feel their effects. And even as we are born men or women, as we die almost always in spite of ourselves, and as we are dominated by the instinct of generation, so we also bear in our temperament certain special conditions which education in the broad sense of the word, or social compact, can modify, it is true, within certain limits, but which they can never suppress. These conditions of temperament, repeated in infinite cases throughout the centuries, constitute what is called the race. For all these reasons, our dependence upon nature, although it has diminished since prehistoric times, continues in our social life, just as the food which the sight of nature affords to the curiosity and the imagination continues also in our social life. Now these effects of nature, and the sentiments immediate or mediate which result from it, although they have been perceived, since history began, only on the visual angle which is given us by the conditions of society, never fail to reflect themselves in the products of art and of religion, and that adds to the difficulties of a realistic and complete interpretation of both. XI. In employing this doctrine as a new principle of research, as a precise means of defining our position, and as a visual angle, will it really be possible finally to arrive at a new narrative history? It is not possible to make an affirmative answer in general to this generic demand. Because, in fact, if we assume that the critical communist, the sociologist of economic materialism, or as he is commonly called, the Marxist, has the necessary critical preparation, the habit of historical study, and also the gift required for an orderly and vivacious narration, there is no reason for affirming that he cannot write history, as heretofore the partisans of all other political schools have written it.