Several reasons may be assigned for the concentration of talent upon history. In the first place, the circumstances of the time made an examination of the foundations of society imperative. This necessity reveals itself everywhere, in poetry, in philosophy, and in theology, as well as in history. The cry is on all sides for reconstruction; and there is a growing sense that the reconstruction must take place upon a groundwork of fact, discoverable only by a study of the past. The pre-Revolutionary writers had relied upon _a priori_ theory, but the immediate results were so different from their anticipations that their successors were little disposed to repeat the mistake. Modern history teaches above all things the lesson of continuity. Institutions change and grow, but they never spring up suddenly like a Jonah's gourd; and even revolutions only modify, they do not annul the past. Science too has had a powerful influence, and the success of the scientific method has encouraged the application of a method similar in principle, though necessarily different in minor points, to the facts of history. The last two generations have witnessed a great extension of the principle of induction in the sphere of history; and as the first step in a complex process of induction is the accumulation of masses of facts, we have here perhaps an explanation of some of the weaknesses of the modern school of history. It is apt to lose itself in detail. The reach of Tacitus or of Gibbon seems no longer attainable, because their successors must know everything, and can with difficulty restrain themselves from stating everything. Some one, doubtless, whether he be called a philosopher or a historian, will ultimately assimilate the masses of information thus laboriously compiled, and the world will once more have the principal results compactly stated and in orderly sequence. Buckle's experiment proves that it is possible to attempt this too soon; but at the same time the welcome that experiment received is an indication that we shall not be permanently satisfied with the fragments and aspects of history which alone the new method as yet yields. Unity of treatment is ultimately as essential in history as codification is in law; and it is essential for much the same reason. The old proverb tells us that the wood may be invisible by reason of the trees.