The state of homogeneity in the social aggregate is an unstable one. The primary political differentiation originates from the primary family differentiation. Men and women very early respectively form the two political classes of rulers and ruled. The slave class acquires separateness only as fast as there arrives some restrictions on the powers of the owners; slaves begin to form a division of the body politic when their personal claims begin to be distinguished as limiting the claims of their masters. Where men have passed into the agricultural or settled state it becomes possible for one community to take possession bodily of another community, along with the territory it occupies. When this happens, there arise additional class divisions. The class differentiation of which militancy is the actual cause is furthered by the establishment of definite descent, especially male descent, and by the transmission of position and property to the eldest son of the eldest continually. Inequalities of position and wealth once initiated tend to increase and to establish physical differences; and beyond these there are produced by the respective habits of life mental differences, emotional and intellectual, strengthening the general contrast of nature. When there come conquests which produce compound societies and doubly compound ones there result superpositions of ranks: while the ranks of the conquering society become respectively higher than those which have existed before, the ranks of the conquered society become respectively lower. The political differentiations which militancy originates and which for a long time increase in definiteness, are at later stages and under other conditions interfered with, traversed, and partially or wholly destroyed. While the higher political evolution of large social aggregates tends to break down the divisions of rank which grew up in the small component social aggregates, by substituting other divisions, these original divisions are still more broken down by growing industrialism. Generating a wealth that is not connected with rank, this initiates a compelling power; and at the same time, by establishing the equal positions of citizens before the law in respect of trading transactions, it weakens those divisions which at the outset expressed inequality of position before the law. POLITICAL FORMS AND FORCES In its primitive form political power is the feeling of the community acting through an agency which it has either informally or formally established; and this public feeling, while it is to some extent the feeling spontaneously formed by those concerned, it is to a much larger extent the accumulated and organised sentiment of the past. Everywhere we are shown that the ruler's function as regulator is mainly that of enforcing the inherited rules of conduct which embody ancestral sentiments and ideas. CHIEFS AND KINGS