change of their contents. To be sure, the continuance of the locality does not of itself alone mean the continuance of the social unity, since, for instance, if the whole population of a state is driven out or enslaved by a conquering group, we speak of a changed civic group in spite of the continuance of the territory. Moreover, the unity of whose character we are speaking is psychical, and it is this psychical factor itself which makes the territorial substratum a unity. After this has once taken place, however, the locality constitutes an essential point of attachment for the further persistence of the group. But it is only one such element, for there are plenty of groups that get along without a local substratum. On the one hand, there are the very small groups, like the family, which continue precisely the same after the residence is changed. On the other hand, there are the very large groups, like that ideal community of the “republic of letters,” or the other international associations in the interest of culture, or the groups conducting international commerce. Their peculiar character comes from entire independence of all attachment to a definite locality.
In contrast with this more formal condition for the maintenance of the group, of incomparably greater importance to the same end is the physiological connection of the generations—in general the whole concatenation of blood relationships. Community of stock is not always enough to insure unity of coherence for a long time. In many cases the local unity must be added. The social unity of the Jews has been weakened to a marked degree since the dispersion, in spite of their physiological and confessional unity. It has become more compact in cases where a group of Jews have lived for a time in the same territory, and the efforts of the modern “Zionism” to restore Jewish unity on a larger scale calculate upon concentration in one locality. On the other hand, when other bonds of union fail, the physiological is the last recourse to which the self-maintenance of the group resorts. The more the German Zünfte declined, the weaker their inherent power of cohesion became, the more energetically did each Zunft attempt to make itself
