namely, _polygyny_, finds favourable conditions of development in the new political order. It receives fresh impetus as a result of that very dominance of man which brought about the transition from the maternal descent of earlier times to paternal descent. Polyandry and group-marriage, on the other hand, have by this time disappeared, either entirely or, at least, with rare exceptions. Moreover, the character of polygyny has changed. This is apparent from the distinction between _chief wife_ and _secondary wife_--a distinction which has, indeed, an analogy in certain phenomena of the totemic period, but which, as a result of the conditions of public life, now rests upon an entirely different basis. The chief wife is taken from one's own tribe; the secondary wife belongs to a strange tribe, being, in many cases, a slave captured in war. Thus, these changes in polygyny reflect the warlike character of the age, as well as a growing tendency toward a return to monogamy. On the other hand, however, we also discern certain tendencies of a retrogressive nature. These occur particularly within Islamitic culture, whenever the difference between chief and secondary wives is either annulled or is subordinated to the will of the husband. Such deviations from the general trend of development are usually attributed to the influence of personalities. It is not impossible, however, that they are due in this case to the fact that Islamism spread to peoples of totemic culture. But in other departments of life also, remnants and traces of totemic culture have passed down to the heroic era. A striking example appears in the case of the Spartan State. The fact that the men lived in the city, engaged in military drill and political affairs, while the women, together with the slaves, cultivated the fields outside of the city, clearly betrays the influence of the ancient institution of the men's club. 5. THE DIFFERENTIATION OF CLASSES.