a perfect concentration of national life and a permanent moral stability? {166}
To a nation with a purpose and a consciously realized destiny some principle of national unity is indispensable. Some strand of feeling which all can share, and in sharing which all can come into communion with one another, will be the framework on which is built up the structure of national energy and effort.
The reactions in which the social instinct manifests itself are not all equally developed in the different social species. It is true that there is a certain group of characteristics common to all social animals; but it is also found that in one example there is a special development of one aspect of the instinct, while another example will show a characteristic development of a different aspect. Taking a broad survey of all gregarious types, we are able to distinguish three fairly distinct trends of evolution. We have the aggressive gregariousness of the wolf and dog, the protective gregariousness of the sheep and the ox, and, differing from both these, we have