An international science of eugenics might in the same way indicate that the various races should aim, not at exterminating each other, but at encouraging the improvement by each of its own racial type. Such an idea would not appeal to those for whom the whole species arranges itself in definite and obvious grades of 'higher' and 'lower,' from the northern Europeans downwards, and who are as certain of the ultimate necessity of a 'white world' as the Sydney politicians are of the necessity of a 'white Australia.' But in this respect during the last few years the inhabitants of Europe have shown signs of a new humility, due partly to widespread intellectual causes and partly to the hard facts of the Russo-Japanese war and the arming of China. The 'spheres of influence' into which we divided the Far East eight years ago, seem to us now a rather stupid joke, and those who read history are already bitterly ashamed that we destroyed by the sack of the Summer Palace in 1859, the products of a thousand years of such art as we can never hope to emulate. We are coming honestly to believe that the world is richer for the existence both of other civilisations and of other racial types than our own. We have been compelled by the study of the Christian documents to think of our religion as one only among the religions of the world, and to acknowledge that it has owed much and may owe much again to the longer philosophic tradition and the subtler and more patient brains of Hindustan and Persia. Even if we look at the future of the species as a matter of pure biology, we are warned by men of science that it is not safe to depend only on one family or one variety for the whole breeding-stock of the world. For the moment we shrink from the interbreeding of races, but we do so in spite of some conspicuous examples of successful interbreeding in the past, and largely because of our complete ignorance of the conditions on which success depends.