§ 13. M.--MS. E. 2 in the Library of St. John's College, Cambridge. Small MS. on vellum, without diagrams. The leaves have been misplaced, and bound up in a wrong order, but nothing is lost. I have printed from this MS. the last five words of sect. 40; also 41-43, and 41_a_-42_b_; besides collating it for the improvement of the text in sect. 44; sect. 45 is missing. I have also been indebted to it for the _Latin_ rubrics to the Conclusions, which I have not found elsewhere. Several various readings from this MS. appear in the Critical Notes (pp. 233-241). § 14. N.--MS. Digby 72, in the Bodleian Library. From this MS. I have printed the text of sections 44 and 45 (pp. 226-9), but have made little further use of it. § 15. O.--MS. Ashmole 360, in the Bodleian Library. Late MS., on paper; former owner's name, Joh_a_n Pekeryng; without diagrams. There are evidently some omissions in it. But it includes sections 44 and 45, and I have given various readings from it in those sections (p. 240). It ends at the end of sect. 43_a_, with the words--'on_e_ to twelfe. _& sic finis_'; see p. 232. § 16. P.--MS. Dd. 12. 51 in the Cambridge University Library. Small MS. on vellum; written in the fifteenth century. The text is by no means a bad one, though the spelling is peculiar. Some of the pages are very much rubbed and defaced. I have taken from it some various readings, recorded in the Critical Notes. One point deserves particular attention. It not only contains the Conclusions of Part ii. _in the right order_, but continues it _without a break_ to the end of Conclusion 43 (p. 225); at the end of which is the colophon--Explicit tractatus astrolabii. § 17. Q.--MS. Ashmole 393, in the Bodleian Library; on paper. Of little importance. R.--MS. Egerton 2622, in the British Museum. A neat MS., but without diagrams. Contains: Part I. (except 15-23); Part II. §§ 1-12, 19-21, 13-18, 22-35, 41-43, 44, 45; 41_a_, 41_b_, 42_a_, 43_a_, 42_b_, 36, 37. Thus it has all the additional sections except 46; but 38-40 are missing. MS. L. contains the same sections in the same order; see § 12. S.--MS. Addit. 29250. A poor MS., but remarkable for containing the scarce section no. 46; of which there is but one other copy, viz. that in MS. E (§ 6); cf. pp. 240, 241. T.--MS. Phillipps 11955; at Cheltenham. On vellum; 31 leaves; said to be of the fourteenth century, which is improbable. U.--MS. Bodley 68. Imperfect; ends at Part ii. § 36. W.--MS. E Museo 116, in the Bodleian Library. A mere fragment. X.--A MS. at Brussels, no. 1591. See F. J. Mone, Quellen und Forschungen, (Aachen, 1830); pp. 549-551. § 18. Of the above MSS., Mr. Brae describes H., I., and L. only, and does not seem to have made use of any others. Mr. Todd, in his Animadversions on Gower and Chaucer, p. 125, enumerates only four MSS., which are plainly A., P., F., and G. The rest seem to have escaped attention.