T ISTENERS to Mr. Vemon Bartlett 's evening talks know how good a guide ho is to political developments in the contemporary world. In these two special talks to secondary schools he will apply his practical knowledge to the theory of international affairs: how disputes arise between nations, and how they are settled. This afternoon he will describe how tho growth of communications, the multiplication of points of contact between countries, and the increased importance of economic rivalry have brought about many new causes of war.