Rome was their centre of unity; and the uniformity with which the circle of the Roman dominion spread around, the regularity with which their civil polity expanded, forced, as it were, upon the Roman historian that plan which Polybius announces as the subject of his history, the means and the manner by which the whole world became subject to the Roman sway.

How different the complicated politics of the European kingdoms! Every national history, to be complete, must, in a certain sense, be the history of Europe; there is no knowing to how remote a quarter it may be necessary to trace our most domestic events; from a country, how apparently disconnected, may originate the impulse which gives its direction to the whole course of affairs.
In imitation of his classical models, Gibbon places Rome as the cardinal point from which his inquiries diverge, and to which they bear constant reference; yet how immeasurable the space over which those inquiries range; how complicated, how confused, how apparently inextricable the causes which tend to the decline of the Roman empire! how countless the nations which swarm forth, in mingling and indistinct hordes, constantly changing the geographical limits--incessantly confounding the natural boundaries! At first sight, the whole period, the whole state of the world, seems to offer no more secure footing to an historical adventurer than the chaos of Milton--to be in a state of irreclaimable disorder, best described in the language of the poet:-- "A dark Illimitable ocean, without bound, Without dimension, where length, breadth, and height, And time, and place, are lost: where eldest Night And Chaos, ancestors of Nature, hold Eternal anarchy, amidst the noise Of endless wars, and by confusion stand." We feel that the unity and harmony of narrative, which shall comprehend this period of social disorganization, must be ascribed entirely to the skill and luminous disposition of the historian.

It is in this sublime Gothic architecture of his work, in which the boundless range, the infinite variety, the, at first sight, incongruous gorgeousness of the separate parts, nevertheless are all subordinate to one main and predominant idea, that Gibbon is unrivalled.

We cannot but admire the manner in which he masses his materials, and arranges his facts in successive groups, not according to chronological order, but to their moral or political connection; the distinctness with which he marks his periods of gradually increasing decay; and the skill with which, though advancing on separate parallels of history, he shows the common tendency of the slower or more rapid religious or civil innovations.

However these principles of composition may demand more than ordinary attention on the part of the reader, they can alone impress upon the memory the real course, and the relative importance of the events.