possession of certain utensils for preserving the things acquired--and then the ornamentation of the body, etc., all this means that at bottom this life rests upon an artificial, although very elementary, basis, upon which men endeavor to fix themselves and adapt themselves,--upon a basis which is after all the condition of all further progress. According as this artificial basis is more or less formed, the men who have produced it and who live in it are considered more or less savage or barbarous. This first formation constitutes what we may call pre-history. History, according to the literary use of the word, namely, that part of the human _processus_ whose traditions are fixed in the memory, begins at a moment when the artificial basis has been formed for a considerable length of time. For example, the canalization of Mesopotamia gives us the ancient pre-Semitic Babylonian state, while the extremely ancient Egyptian civilization rests upon the application of the Nile to agriculture. Upon this artificial basis, which appears in the extreme horizon of known history, lived, as now, not shapeless masses of individuals, but organized groups whose organization was fixed by a certain distribution of tasks, that is to say, of labor and by consecutive methods of co-ordination and subordination. These relations, these connections, these ways of living were not and are not the result of the crystallization of customs under the immediate action of the animal struggle for existence. What is more, they presuppose the discovery of certain instruments, and, for example, the domestication of certain animals, the working of minerals and even of iron, the introduction of slavery, etc., instruments and methods of economy which have first differentiated communities from each other and have subsequently differentiated the component parts of these communities themselves. In other words, the works of men in so far as they live together react upon the men themselves. Their discoveries, and their inventions, by creating artificial ways of living, have produced not only habits and customs (clothing, cooking of food, etc.), but relations and bonds of coexistence proportioned and adapted to the mode of production and reproduction of the means of immediate life.