A composite manuscript probably made up from unbound fragments, on different paper stocks. Comprising:
(i) pp. 1-2: A leaf containing on p. 1 a grammar in the hand of Siôn Cain.
(ii) pp. 3-56: A compilation on bardic grammar, evidently a personal draft, in the hand of Rhys Cain, largely corresponding to the grammars of Gutun Owain and Simwnt Fychan [Gramadegau’r Penceirddiaid, eds G.J. Williams and E.J. Jones (Caerdydd, 1934), p. lvi]; the section ‘Y beiau gwaharddedig’ (pp. 33-40) is printed from here in Gramadegau’r Penceirddiaid, pp. 194-6.
(iii) pp. 57-84: All in the later hand of John Davies of Mallwyd [not before 1617, since there are references to his collection of Lewys Glyn Cothi, London, British Library, Additional MS 14871]. Includes: quotations from the Cywyddwyr, classified to exemplify beiau and questionable cases (‘edrych y rhain’) (pp. 57-68); quotations from the Cywyddwyr exemplifying words, alphabetically arranged (pp. 69-77); further quotations (pp. 80-1); notes, with folio references, to his collections of poetry (p. 84). All leaves of this part have suffered damage by rodents.