It is very clear that the 'balance of power' system of Europe, and the continental system which this war is waged on our part to sustain, are very unlike, if not antagonistic systems. The tone, all through the war, of a large portion of the British daily press, and of much of her weightier literature; the intrigues of Napoleon and the outspeaking of his minions, together with the measures which have been clandestinely taken by persons of power and influence to advance the interests of secession, show that there are influential classes in Western Europe, allied by interest to her fragmentary political organizations, who would gladly see the United States broken to pieces under the shock of rebellion. Their sympathies have been with the rebellion all through the war; and that they have not interfered more actively than they have, is not to be attributed to their sincere love for justice and neutrality, but to their own weakness--to the complicated nature of their own diplomacy, and its critical status just now, when there is danger of bursting volcanoes in their own midst. It is a law of history that any political system of some degree of prevalence seeks to extend itself; indeed, this is a law of all movement, whether physical, chemical, social, or political. There is a political leaven which permeates the whole mass, and brings it into the same condition. It resulted once in the general prevalence of feudalism; it afterward touched the cities of civilizing Europe, and they became independent, and leagued together for a common purpose. It operated again, and governments of organized and more orderly character came into existence all over what was once feudal Europe. The prevailing system, or that which is animated by the strongest and most active principle, necessitates whatever is unlike it to become of the same character with itself, even though it might seem like the surrender of the better for the worse. This is very aptly shown by the fact that under feudalism allodial titles were voluntarily surrendered for feudal ones. This system subordinated even the church. The question is legitimate: Have we nothing to fear from the leaven of political fragmentarism in Europe? Is there not vitality enough in the little-monarchy and balance-of-power system of Middle and Western Europe to extend its influence into this country, contributing effectually to the overthrow of American unity; and, by the operation of this political 'induction,' making the political system of America like the political system of Europe? Or, has the time come for the more permanent inauguration of the policy of continental unity--a system of very different genius from that which prevails in the former centres of civilization? We believe that there are the most rational grounds for encouragement.