It is according to this law that great historic currents are formed, meaning by this, the long rule of a form of intellect or of a master idea, like that period of spontaneous creations called the Renaissance, or that period of oratorical classifications called the Classic Age, or that series of mystic systems called the Alexandrine and Christian [epoch], or that series of mythological efflorescences found at the origins of Germany, India, and Greece. Here as elsewhere, we are dealing merely with a mechanical problem: the total effect is a compound wholly determined by the grandeur and direction of the forces which produce it. The sole difference which separates these moral problems from physical problems lies in this, that in the former the directions and grandeur cannot be estimated by or stated in figures with the same precision as in the latter. If a want, a faculty, is a quantity capable of degrees, the same as pressure or weight, this quantity is not measurable like that of the pressure or weight. We cannot fix it in an exact or approximative formula; we can obtain or give of it only a literary impression; we are reduced to noting and citing the prominent facts which make it manifest and which nearly, or roughly, indicate about what grade on the scale it must be ranged at. And yet, notwithstanding the methods of notation are not the same in the moral sciences as in the physical sciences, nevertheless, as matter is the same in both, and is equally composed of forces, directions and magnitudes, we can still show that in one as in the other, the final effect takes place according to the same law. This is great or small, according as the fundamental forces are great or small and act more or less precisely in the same sense, according as the distinct effects of race, environment and epoch combine to enforce each other or combine to neutralize each other. Thus are explained the long impotences and the brilliant successes which appear irregularly and with no apparent reason in the life of a people; the causes of these consist in internal concordances and contrarieties. There was one of these concordances when, in the seventeenth century, the social disposition and conversational spirit innate in France encountered drawing-room formalities and the moment of oratorical analysis; when, in the nineteenth century, the flexible, profound genius of Germany encountered the age of philosophic synthesis and of cosmopolite criticism. One of these contrarieties happened when, in the seventeenth century, the blunt, isolated genius of England awkwardly tried to don the new polish of urbanity, and when, in the sixteenth century, the lucid, prosaic French intellect tried to gestate a living poesy. It is this secret concordance of creative forces which produced the exquisite courtesy and noble cast of literature under Louis XIV and Bossuet, and the grandiose metaphysics and broad critical sympathy under Hegel and Goethe. It is