The work originated in the editor’s habit of noting on the margin of his copy of Gibbon references to such authors as had discovered errors, or thrown new light on the subjects treated by Gibbon. These had grown to some extent, and seemed to him likely to be of use to others. The annotations of M. Guizot also appeared to him worthy of being better known to the English public than they were likely to be, as appended to the French translation. The chief works from which the editor has derived his materials are, I. The French translation, with notes by M. Guizot; 2d edition, Paris, 1828. The editor has translated almost all the notes of M. Guizot. Where he has not altogether agreed with him, his respect for the learning and judgment of that writer has, in general, induced him to retain the statement from which he has ventured to differ, with the grounds on which he formed his own opinion. In the notes on Christianity, he has retained all those of M. Guizot, with his own, from the conviction, that on such a subject, to many, the authority of a French statesman, a Protestant, and a rational and sincere Christian, would appear more independent and unbiassed, and therefore be more commanding, than that of an English clergyman. The editor has not scrupled to transfer the notes of M. Guizot to the present work. The well-known zeal for knowledge, displayed in all the writings of that distinguished historian, has led to the natural inference, that he would not be displeased at the attempt to make them of use to the English readers of Gibbon. The notes of M. Guizot are signed with the letter G. II. The German translation, with the notes of Wenck. Unfortunately this learned translator died, after having completed only the first volume; the rest of the work was executed by a very inferior hand. The notes of Wenck are extremely valuable; many of them have been adopted by M. Guizot; they are distinguished by the letter W.* III. The new edition of Le Beau’s “Histoire du Bas Empire, with notes by M. St. Martin, and M. Brosset.” That distinguished Armenian scholar, M. St. Martin (now, unhappily, deceased) had added much information from Oriental writers, particularly from those of Armenia, as well as from more general sources. Many of his observations have been found as applicable to the work of Gibbon as to that of Le Beau.