[1] The building of houses. With savages each family has as a matter of course its own cave or hut like the separate family tent of the nomads. This separate domestic economy is made only the more necessary by the further development of private property. With the agricultural peoples a communal domestic economy is just as impossible as a communal cultivation of the soil. A great advance was the building of towns. In all previous periods, however, the abolition of individual economy, which is inseparable from the abolition of private property, was impossible for the ****** reason that the material conditions governing it were not present. The setting-up of a communal domestic economy presupposes the development of machinery, of the use of natural forces and of many other productive forces -- e.g. of water-supplies, of gas-lighting, steam-heating, etc., the removal [of the antagonism] of town and country. Without these conditions a communal economy would not in itself form a new productive force; lacking any material basis and resting on a purely theoretical foundation, it would be a mere freak and would end in nothing more than a monastic economy -- What was possible can be seen in the towns brought about by condensation and the erection of communal buildings for various definite purposes (prisons, barracks, etc.). That the abolition of individual economy is inseparable from the abolition of the family is self-evident.
The production of life, both of one's own in labour and of fresh life in procreation, now appears as a double relationship: on the one hand as a natural, on the other as a social relationship. By social we understand the co-operation of several individuals, no matter under what conditions, in what manner and to what end. It follows from this that a certain mode of production, or industrial stage, is always combined with a certain mode of co-operation, or social stage, and this mode of co-operation is itself a "productive force". Further, that the multitude of productive forces accessible to men determines the nature of society, hence, that the "history of humanity" must always be studied and treated in relation to the history of industry and exchange. But it is also clear how in Germany it is impossible to write this sort of history, because the Germans lack not only the necessary power of comprehension and the material but also the "evidence of their senses", for across the Rhine you cannot have any experience of these things since history has stopped happening. Thus it is quite obvious from the start that there exists a materialistic connection of men with one another, which is determined by their needs and their mode of production, and which is as old as men themselves. This connection is ever taking on new forms, and thus presents a "history" independently of the existence of any political or religious nonsense which in addition may hold men together.
Only now, after having considered four moments, four aspects of the primary historical relationships, do we find that man also possesses "consciousness", but, even so, not inherent, not "pure" consciousness. From the start the "spirit" is afflicted with the curse of being "burdened" with matter, which here makes its appearance in the form of agitated layers of air, sounds, in short, of language. Language is as old as consciousness, language is practical consciousness that exists also for other men, and for that reason alone it really exists for me personally as well; language, like consciousness, only arises from the need, the necessity, of intercourse with other men.
Where there exists a relationship, it exists for me: the animal does not enter into "relations" with anything, it does not enter into any relation at all. For the animal, its relation to others does not exist as a relation.