righteous as that of their predecessors. But there is another form of class distinction besides the one described. The natural division of labor in the agricultural families permitted at a certain point of prosperity the introduction of foreign labor power. This was particularly the case in countries where the old common ownership of the soil had disappeared or where at least the old system of common cultivation had become supplanted by the cultivation of separate plots by individual families. Production had so far developed that the human labor force was able to produce more than was necessary for the support of the individual laborer. The time was ripe for the employment of more labor-power, labor-power had become a value. But the limitations of the communal system did not afford any attainable surplus labor power. Yet war did give such an opportunity for getting surplus labor power and war was as old as the simultaneous existence of groups of communal groups in close juxtaposition. Up to this time men did not take prisoners of war, they killed them right off, and, at a still earlier date, they ate them. But at the stage of economic development of which we speak they had a value and they were not only allowed to live but were set to work. So force instead of being the master of economic conditions was pressed into the service of those conditions. Slavery was discovered. It soon became the dominant form of production among all people who had developed beyond the tribal communal stage and as a matter of fact was at the end one of the main reasons for the break up of the communal system. Slavery first made the division of labor between agriculture and industry completely possible and brought into existence the flower of the old world, Greece. Without slavery there would have been no Grecian state, no Grecian art and science and no Roman Empire. There would have been no modern Europe without the foundation of Greece and Rome. We must not forget that our entire economic, political and intellectual development has its foundation in a state of society in which slavery was regarded universally as necessary. In this sense we may say that without the ancient slavery there would have been no modern socialism.