Of all the modern steps towards international unity, the most indisputable, the most firmly based and furthest-reaching, is science, and the various applications of science, both in promoting intercourse between different parts of the world and in alleviating suffering and strengthening and illuminating human life. The more prominence, therefore, that we can secure for the growth of science in the teaching of history, the larger place humanity, or the united mind of mankind, will take in the moving picture which every one of us has, more or less full and distinct, of the progress of the world. For some hundreds of years, culminating in the three or four centuries A.D., the dominant feature in the picture was of a triumphant city-state, Rome, gradually subduing and embracing the world. Then for some thousand years the picture was of a religious organization leading the civilized world, and nationalities were only emerging as somewhat dim and ill-defined figures. Then, with the rupture in the Church and the upspringing of other religious bodies and forms of thought, national figures become predominant in the scene, and attract nearly all the attention, which is given, except by a few curious persons, to the study of history. Nationalism, once in defect in Western Europe, has been for some time in excess. The remedy is not directly to attack it, except in the case in which it gave us no choice, but to supply the limiting and controlling ideas. Of all these, science fits the case most exactly, because, as science, it can know no distinction between French or German, English or Russian. There is no French physics or German chemistry, and if we are told that the Prussians have their own theory of anthropology, based on the predominance of a particular type of skull which other anthropologists dispute, we are quite sure that in that case science has not yet said her last word. We put physical science first because it contains the largest number of certain and accepted laws. The further we get from mathematical exactness the more liable we are to differences of opinion, which may, as in the case of anthropology, cluster round some question of national pique. But it would be easy to trace through all the sciences, and into philosophy and religion, a growing unity of method and result before which national differences often resolve themselves into a difference of style. The style is the nation's, but the truth is mankind's.