The fifth commandment of biology is the duty of internationalism. Even a scientific civilization, if it be only national, will soon be crushed by war. It will never make war, but it must defend itself. No nation can, therefore, remain civilized until all nations are civilized. War has scarcely more selective survival-value than an earthquake. And just as earthquakes and volcanoes are going out of fashion, so was must go the same way. Your nationalistic slogans are not only insufficient unto a world order, but they are not even sufficient unto a permanent national order. Moreover, vast problems of race migrations, mixtures and hybridizations will tomorrow tax all the genius of both science and statesmanship. Biology has exploded the myth of the melting-pot as well as the myth of war. Each race and nation must still create its own culture, its own national or racial psychology, its own specific intellectual discipline. But if one culture crushes another by war, or great spiritual disciplines are lost by hybridizations of strange and disharmonic peoples, all civilization will go down in the biological holocaust. Consequently your narrow nationalistic patriotisms, loyalties, and ambitions must merge, not disappear, but merge into the larger loyalties, the wider moralities, and the higher processes of the unitary development of man. [section symbol] 13 Lastly, the sixth commandment of biology is the duty of art. Art is the herald of the march of evolution. Biology has suddenly given to art a new and incalculable significance. The very face and form of man have probably changed under its influence, for beauty sets up ideals of mate selection between man and woman. And mate selection between man and woman is the supreme cause of both racial glory and decline. Art 15 [end]