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.

An imperfect manuscript lettered 'Llyfr Tesni' containing astrological and other texts and tables, such as 'llyma y XII Arwydd', 'helynt yr wybyr' ('devddeg gwynt y sydd'), 'Arwyddion' based on the incidence of thunder within each month, 'llyma Rifedi yr hyn sydd, o orie ymhob mis or flwyddyn', 'llyma glandyr a elwir treiad ymryson', a table for the years 1690-1794 indicating the golden number ('prif') and dominical letter ('llythyren y Svl'), 'devddec mis sydd yn y flwyddyn', 'englynion ir prifiav ysydd yn y misoedd hyny', a table of the cycle of the sun and the moon, 'Brevddwidion y lloer yn ol llyfr y gwybodeth', 'Era Pater', 'Englynion y Misoedd' by Aneirin gwawdydd ('yn llys Maelgwyn gwynedd Brenin Brytaniaid'), 'Englynion yr Eira Mynydd' by Mabgloch ab Llowarch hen, 'Cowydd ir ffenix' by Sion Phylip, 'devddeg gair gwir', 'Cowydd ir devddeg gair gwir, by Thomas ap Evan (1629), and 'llyma henwav y brenhinoedd a farnwyd yn ore or brytaniaid ... 24 sydd o honynt. The volume was written by Richard 'ysgripiwr' (the scribe) during the period January ? 1691/2 - April 1692; in addition, some recipes (for ink, how to write with gold) in an 18th century hand.