(5) All the great problems of our time are problems of the moment and are only the results of certain definite causes. And among all those there is only one that has a profoundly causal significance. This is the problem of preserving the pure racial stock among the people. Human vigour or decline depends on the blood. Nations that are not aware of the importance of their racial stock, or which neglect to preserve it, are like men who would try to educate the pug-dog to do the work of the greyhound, not understanding that neither the speed of the greyhound nor the imitative faculties of the poodle are inborn qualities which cannot be drilled into the one or the other by any form of training. A people that fails to preserve the purity of its racial blood thereby destroys the unity of the soul of the nation in all its manifestations. A