A similar phenomenon occurred once before in German history, and it is not an uncommon incident in human experience when nature has already made, or is on the brink of making, a change in the seat of the economic centre of the world. In the same way, when Constantine won the battle of the Milvian Bridge, with his men fighting under the standard of the Labarum, it was subsequently found that the economic capital of civilization had silently migrated from the Tiber to the Bosphorus, where Constantine seated himself at Constantinople, which was destined to be the new capital of the world for about eight hundred years. So in 1792, when the Prussians and the French refugees together invaded France, they never doubted for an instant that they should easily disperse the mob, as they were pleased to call it, of Kellermann’s “vagabonds, cobblers, and tailors.” Nevertheless the Germans recoiled on the slope of Valmy from before the republican army, almost without striking a blow, nor could they be brought again to the attack, although the French royalists implored to be allowed to storm the hill alone, provided they could be assured of support. Then the retreat of the Duke of Brunswick began, and this retreat was the prelude to the Napoleonic empire, to Austerlitz, to Jena, to the dismemberment and to the reorganization of Prussia and to the evolution of modern Germany: in short, to the conversion of the remnants of mediæval civilization into the capitalistic, industrial, competitive society which we have known. And all this because of the accelerated movement caused by science.