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. Whoever would justly appreciate the superiority of Gibbon's lucid arrangement, should attempt to make his way through the regular but wearisome annals of Tillemont, or even the less ponderous volumes of Le Beau. Both these writers adhere, almost entirely, to chronological order; the consequence is, that we are twenty times called upon to break off, and resume the thread of six or eight wars in different parts of the empire; to suspend the operations of a military expedition for a court intrigue; to hurry away from a siege to a council; and the same page places us in the middle of a campaign against the barbarians, and in the depths of the Monophysite controversy. In Gibbon it is not always easy to bear in mind the exact dates but the course of events is ever clear and distinct; like a skilful general, though his troops advance from the most remote and opposite quarters, they are constantly bearing down and concentrating themselves on one point -- that which is still occupied by the name, and by the waning power of Rome. Whether he traces the progress of hostile religions, or leads from the shores of the Baltic, or the verge of the Chinese empire, the successive hosts of barbarians -- though one wave has hardly burst and discharged itself, before another swells up and approaches -- all is made to flow in the same direction, and the impression which each makes upon the tottering fabric of the Roman greatness, connects their distant movements, and measures the relative importance assigned to them in the panoramic history. The more peaceful and didactic episodes on the development of the Roman law, or even on the details of ecclesiastical history, interpose themselves as resting-places or divisions between the periods of barbaric invasion. In short, though distracted first by the two capitals, and afterwards by the formal partition of the empire, the extraordinary felicity of arrangement maintains an order and a regular progression. As our horizon expands to reveal to us the gathering tempests which are forming far beyond the boundaries of the civilized world -- as we follow their successive approach to the trembling frontier -- the compressed and receding line is still distinctly visible; though gradually