WORLD-POPULATION AND NATIONALISM 101 the recent war has also shown that they may be terrible.” Every student of the possibilities of future wars realises that the dangers that threaten mankind in future wars are ghastly. Clearly it makes all the difference whether the purpose behind nationality is solely egoistic, or is not so. Inherently nationality is not necessarily detri- mental to humanity and to the life of larger numbers on earth. But nationalism, which is the expression of a system of economics, intended to exploit all chances, irrespective of the humanity of so doing, and is more- over the organisation of power in order to ensure the success of such a system, regardless of its incidence, can have no place in the hearts of those who hope for the betterment of mankind, and hope that peace on earth may yet be attained. That attitude on the part of a people which is con- sistent with, or makes it sympathetic with, the genuine advances of other peoples, creates possibilities of inter- national goodwill, and gives birth to the sense of an international solidarity. Man has acquired and is still acquiring such knowledge that, organised for maleficent ends, he can become more and more an enemy to his fellows. His destructive powers are already very terrible, and can wreck in moments the labour of years and even of centuries. The facility with which he can injure the human organism and destroy life is enormously developed, hence knowledge is a potential power for evil as well as good. If organised for beneficent ends, it is solely a power for good. The reactions certainly seem to be, in this latter direction, less powerful, but they lead to a higher culture of the spirit of humanity—a higher civilisation. Difficulties as between nation and nation tend then, and then only, to disappear, and it becomes possible for man to multiply and replenish the face of the earth, with joy, or rather well-being, for all.