Dr. M'Crie states, that "the First and Fourth Books were composed during the years 1566, 1567, and 1568," and that "some additions were made to the Fourth Book so late as 1571." The only evidence to support this supposition, is founded upon the circumstance of some marginal notes having been added in those years, and introduced by subsequent transcribers, as belonging to the text. Whether the Fifth Book, published by David Buchanan in 1644, was actually written by the Reformer, will be considered in the preliminary notice to that Book. Meanwhile it may be remarked, that the Author himself whilst occasionally engaged in collecting materials for a continuation of his History, felt the necessity of delaying the publication; and in a letter addressed to Mr. John Wood, 14th February 1567-8, he expresses the resolution he had formed of withholding the work from the public during his own life. MANUSCRIPT COPIES OF THE HISTORY. The Manuscript of the HISTORY OF THE REFORMATION which has been followed in this edition, fully confirms the preceding statements regarding the period of its composition. It also serves to shew that no suppressions or alterations had been made by his friends, after his death, in these Four Books. Such an intention is alluded to, in a letter, dated from Stirling, 6th August 1572, and addressed to Randolph, by George Buchanan:--"As to MAISTER KNOX, his HISTORIE is in hys freindes handes, and thai ar in consultation to mitigat sum part the acerbite of certain wordis, and sum taunts wherein he has followit too muche sum of your Inglis writaris, as M. Hal. et suppilatorem ejus Graftone, &c." The Manuscript contains Four Books, transcribed by several hands, and at different intervals. Notwithstanding this diversity of hand-writing, there is every reason to believe that the most considerable part of the volume was written in the year 1566, although it is not improbable that in the Second and Third Books a portion of the original MS. of 1559 may have been retained. The marginal notes, which specify particular dates, chiefly refer to the years 1566, or 1567, and they leave no doubt in regard to the actual period when the bulk of the MS. was written, as those bearing the date 1567 are clearly posterior to the transcription of the pages where they occur. Some of these notes, as well as a number of minute corrections, are evidently in Knox's own hand; but the latter part of Book Fourth could not have been transcribed until the close of the year 1571. This is proved by the circumstance that the words, "BOT WNTO THIS DAY, THE 17. OF DECEMBER 1571," form an integral part of the text, near the foot of fol. 359, in "The Ressonyng betuix the Maister of Maxwell and John Knox." The whole of this section indeed is written somewhat hastily, like a scroll-copy, probably by Richard Bannatyne, his Secretary, from dictation; but whether it was merely rewritten in 1571,