There have been various geographical subjects studied in relation to the insular community. But recently there has been a tendency to extend such studies from a mere descriptive stage to the comprehensive stage, dealing with the general features and characteristics of the subject under consideration. In other words, the mere descriptive geography developed into what is called insular geography. In order to accomplish this object, an analytical study of the social structure and function must be made clear. We have to consider many and various themes to make a special study of, and we wish to place some of these problems for the consideration of those who are interested in the study. The writer's conclusions are as follows.-
(1) On the existence of the insular community. The insular community can not enjoy its existence independently, but it can continue its existence only in relation with that of the community in the mainland. Each separate island has its own direct relation with the mainland, and all the islands forming a group are brought into a close connection with each other through the medium of the chief island in the group.
(2) The origin and growth of the insular community. How the insular community began to have its existence has yet been made clear. It is true that many relics of the inhabitants in pre-historic times can be found now, but no satisfactory explanation can yet be found about the connection between the social life in those distant times and that of the present day. In the case of those communities formed in more recent times, we have much historical data by which we can make through researches. Among such communities we find them changing from unified form of living into differentiated one of the same.
(3) Structure of the insular community. It is recognized that the insular community found itself under strong control of the natural enviroment, and that each individual's consciousness of this fact comes together to give birth to one common and general consciousness which results in co-operation in such societies. And from such a point of view, the existence of communitistic relations in primitive society is pre-suppose. To the writer of the present article, it seems that the co-operative tendency of the insular community can only be found in more developed stages in such a society. This problem needs more detailed reseach later on.
(4) Separation of the insular community. The growing community branches itself out in various ways. In one case, such a movement is effected within the island itself, in another case it extends itself into some other island, and in still other case; it is devided against itself.

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