Startling as these assertions may appear at first sight, they are, notwithstanding, profoundly philosophical; all history proclaims their solemn truth--is, in fact, totally inexplicable and confused on any other supposition. History is by no means merely biography condensed; far from it; biography is concerned with the shifting and ephemeral career of individual men; but history, far transcending that lowly sphere, records the revolution and progress of principles; these succeed each other in everlasting succession, like the revolution of day and night; and individuals rise into importance only as they stand related to, are the agents of, this progress. The future is forever supplanting the present; the feud is immortal--the antagonism inevitable; if effete ideas and principles, which have accomplished their mission, refuse to retire and peaceably give place to their legitimate successors, conflict arises of necessity--a conflict in which the usurper must finally triumph, or the wheels of human progress will be effectually blocked. War, then, is necessary to the advance of humanity. Although De Quincey discerns the absolute extinction of war only at the 'infinite and starry distance of the Millennium,' still, as its enginery is becoming more and more destructive, its danger and expense increasing, as the progress of civilization is gradually effacing the darker stains from human society, and luring it from the path of violence by the charm of luxurious repose, the necessity of war will gradually disappear--its total decline approach. We would remark in passing that De Quincey is altogether too captious in his criticisms upon French ideas of war. So far as the majority of men are concerned, whether Englishmen or Frenchmen, little pain is taken to search out the philosophy of events. But Cousin, in his 'Course of History,' has asserted, even more peremptorily than De Quincey himself, the divine mission of war. He essentially declares that carnage is always and of necessity God's daughter: to this extreme doctrine Mr. de Quincey would doubtless demur, averring that 'by possibility' such _might_ not be the case.