increasingly the product or the pride of national patriots. So much is nationalism a commonplace in the modes of thought and action of the civilized populations of the contemporary world that most men take nationalism for granted. Without serious reflection they imagine it to be the most natural thing in the universe and assume that it must always have existed. What has given such a vogue to nationalism in recent times? That is the first major question to be raised concerning this most vital phenomenon. The citizen armies of Cromwell and Napoleon were the ideal manifestations of the new technology. * As an historian Hayes knows well (p. 290) that there is a mystery about nationalism. It never existed before the