The name Dorsum Britanniæ implies that it was part of the ridge which might be called the backbone of Britain, separating the rivers flowing in opposite directions, as the backbone of the body separates the ribs—a definition that never could be applicable to the so-called Grampians. The name of Drum is found, too, attached to the range along the whole course of it. We have Tyn_drum_ and Cairn_drum_ at the part whence the Tay flows; the _Drum_mond hills at the source of the Spey where the range divides Badenoch from Lochaber; Acha_drum_ where it crosses the great glen of Scotland between Loch Oich and Loch Lochy; and Loch _Droma_ where it crosses the valley called the Deary-mor, in Ross-shire, at the head of the river Broom. Footnote 7: Provinciis septentrionalium Pictorum, hoc est, eis quae arduis atque horrentibus montium jugis ab australibus eorum sunt regionibus sequestratae.—B. iii. c. iv. Footnote 8: Montes qui dividunt Scotiam ab Arregaithel.—_Chron. Picts and Scots_, p. 135. Footnote 9: Quos utrosque Dorsi montes Britannici disterminant.—Adamnan, B. ii. c. 47. Footnote 10: The essays contained in the appendix are of peculiar value, and well deserve the consideration of historians. Footnote 11: The author has collected the materials prior to Fordun’s Chronicle in the volume of _The Chronicles of the Picts, Chronicles of the Scots, and other early Memorials of Scottish History_, published by the authority of the Lords Commissioners of her Majesty’s Treasury, under the superintendence of the Lord Clerk Register of Scotland, in 1867, and has likewise edited Fordun’s Chronicle for the series of the Scottish Historians. The introductions to these two works contain a critical examination and analysis of these early documents as well as of the chronicle itself. In the _Four Ancient Books of Wales_, published in 1868, he has subjected the Welsh documents to a similar critical examination. Footnote 12: Burton’s _Hist._, vol. i. Preface, p. v. Footnote 13: It is curious how difficult it is to get rid of the effects of an imposture of this kind, even after it is detected.