THE mechanism of international affairs has changed beyond all recognition since the end of the nineteenth century. Speed of communication and transport—trains and motorcars, cable, wireless and long-distance telephone, have affected both diplomatic methods and the state of public opinion as between different nations ; whilst a whole system of international organizations has sprung up, culminating in the League of Nations. The combined effect of all these changes will be the subject of the three talks by tho Professor of International Relations at London University, the first of which will be given this afternoon.