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 edition of the 'Gwentian Code' ceases using this codex at the very same point where he metes out like treatment to Y ; and he states of Z at the beginning of the Laws of the Gwlad that it ' is carelessly transcribed and has many chasms ', for which reason he leaves it. He inserts variant readings, however, from Z in vol. II of his work. Z is the codex which with S (the Brit. Mus. Additional MS. 22356 of the late fifteenth century) provides Owen with an interesting but extremely untrustworthy addition to the preface of his ' Dimetian Code '.

U and X

U = Peniarth MS. 37. Vellum ; 5⅜ x 4⅛ inches ; 156 pages (pp. 153-6 being in court hand) ; late thirteenth century, in the same hand apparently as Peniarth MS. 35 (MS. G) with very numerous sectional initials and titles in rubrics, and also rubricated letters ; 18 lines to the page ; partly gall-stained but complete ; in old binding newly covered with pigskin. The text of pp. 131-52 is no part of the Book of Cyvnerth, but is taken from the Book of Gwynedd, being found in A and its important transcript E. Dr. Evans, however, finds that it is in such close agreement with the corresponding part in G that both must be from the same archetype or the one is a copy of the other, both MSS. belonging to the same school of writing and being possibly the work of the same scribe. It will be found reproduced with translation in Y Cymmrodor, vol. XVII. The Book of Cyvnerth, properly so called, covers the first 120 pages, and was adopted by Aneurin Owen as the basis of his