THE vogue of a doctrine depends more upon the will to believe than upon the intellectual conviction which it carries. The famous doctrine of "the biological necessity of war" has recently lost some of its former popularity. At the moment men are no longer disposed to look for a scientific justification of warfare. It is doubtful, however, whether the unsoundness of the doctrine is better understood now than formerly. Indeed the obvious conclusion to draw from the nature of the struggle for existence, as popularly understood, is that contest is in the nature of things. Warfare is only the name

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