That proved two things: Firstly, that the social differentiation and the division of property in the sinking Roman empire corresponded perfectly to the contemporaneous stage of production in agriculture and industry, and hence was unavoidable; secondly, that this stage of production had not been essentially altered for better or worse during four hundred years, and therefore had necessarily produced the same division of property and the same classes of population. The town had lost its supremacy over the country during the last centuries of the Roman empire, and had not regained it during the first centuries of German rule. This presupposes a low stage of agriculture and industry. Such a general condition produces of necessity the domination of great proprietors and the dependence of small farmers. How impossible it was to graft either the slave labor of Roman latifundian economy or the compulsory labor of the new large scale production into such a society, is proved by Charlemagne's very extensive experiments with his famous imperial country residences that left hardly a trace. These experiments were continued only by the convents and brought results only for them. But the convents were abnormal social institutions, founded on celibacy. They could do exceptional work, but they had to remain exceptions themselves for this very reason. Yet some progress had been made during these four hundred years. Although in the end we find the same main classes as in the beginning, still the human beings that made up these classes had changed. The ancient slavery had disappeared; gone were also the beggared freemen who had despised work as slavish. Between the Roman colonist and the new serf, there had been the free Frank peasant. The "useless remembrance and the vain feud" of the decaying Roman nation was dead and gone. The social classes of the ninth century had been formed during the travail of a new civilization, not in the demoralization of a sinking one. The new race, masters and servants, were a race of men as compared to their Roman predecessors. The relation of powerful landlords to serving peasants, which had been the unavoidable result of collapse in the antique world, was for the Franks the point of departure on a new line of development. Moreover, unproductive as these four hundred years may appear, they left behind one great product: the modern nationalities, the reorganization and differentiation of West European humanity for the coming history. The Germans had indeed infused a new life into Europe. Therefore the dissolution of the states in the German period did not end in a subjugation after the Norse-Saracene plan, but in a continued development of the estate of the royal beneficiaries and an increasing submission (commendatio) to feudalism, and in such a tremendous increase of the population, that no more than two centuries later the bloody drain of the crusades could be sustained without injury.