A manuscript containing poetry (pp. 17-42), the poets including Taliesin, Iolo Goch, Dafydd ab Edmwnt and others, with poetry included also within other sections of the text; triads attributed to Taliesin (p. 16); the Rood legend (pp. 97-103); apocryphal gospels (pp. 104-153, 259-269, 272, 274-276); the Purgatory of Patrick (pp. 202-212); lives of saints (pp. 161-187); proverbs and adages, etc. (pp. 10-12, 14-15, 299-300); prayers (pp. 13, 238-250, 255); vocabulary (pp. 95-96); a planisphere, calendar, planetary tables and other astrological material (pp. 43-86, 89-90, 281-291); interpretation of dreams (pp. 91, 94); palmistry (pp. 92-93); directions concerning bleeding, medical recipes, etc. (pp. 1-9, 87-88, 236, 277-280, 300c-301); &c. A note on p. 221 states that 'Ieuan ap William ap dd: ap ejnws ajysgrivenodd yllyvr hwn i gyd ari gost ihvn i gael o bobyl ddifyrwch o hono alles yw heneidiav o hwn'; there are, however, a few pages (pp. 139-142, etc.) in other hands. There is a table of contents at the beginning in the hand of Richard Morris, 1784-1785, and another at the end by ?William Jones, who states that the manuscript was 'procured me by Mr. Holmes of the Tower'.
The dates appended to many of the subjects in the text show that the binder is responsible for the present derangement of the folios.

A collection of prose texts including 'Imago Mundi' (beginning wanting); weather lore; 'Ystorya Adaf ar wir groc'; proverbs (A-O); the life of St Catherine; 'Llythyr brenhin yr India'; the duration of the world; times of moonrise; geometry; interpretation of dreams; 'Y gorcheston'; triads; 'cynneddfeu meddawt'; 'cynghoreu Kadw'; woes; 'rhinwedau efferen Sul'; 'py delw y dyly [dyn] gredu y duw'; chronology to 1321; 'Breudwyt Pawl'; 'rhinwedeu lloer'; a note on early British history; 'y tri broder da'; 'Diwed Meir Vorwyn'; 'Adrian ac Ipotis'; 'Ystorya Titus'; 'Enryveddodeu Ynys Brydein'; 'Pwyll y Pader'; and the life of St David (end wanting).