A composite volume in three parts, dated to the late-fifteenth century (pp. 1-32), 1650 (pp. 33-48) and the eighteenth century (pp. 49-102), containing astrological material (pp. 2, 15-16, 95-98, 26-32); names of plants in Latin and Welsh (p. 3); charms (pp. 4-6); the Paternoster, with every sentence explained (p. 7b); theological tracts (pp. 10-14); a commentary on the Prophecies, dated 5 May 1650 (pp. 33-48); fragments of Bruts (pp. 49-64, 71-74, 83-94); a list of the hundreds and commotes of Wales (pp. 99-100) and of the parishes of Carmarthenshire (pp. 101-102); etc.
On p. 6 is the note 'Gruff: llwyd ap Madoc Dd. a wnaeth y llyvyr hwnn i T. ap howel'.

A manuscript containing poetry by Iolo Goch, Dafydd ab Edmwnd, Guto'r Glyn, Lewis Glyn Cothi, Wiliam Llŷn and others.

A manuscript containing poetry by Guto'r Glyn, Siôn Tudur, Wiliam Llŷn, Gruffydd Phylip and others.

A manuscript in the autograph of Evan Evans (Ieuan Fardd) containing poetry by Iolo Goch, Dafydd ap Gwilym, Siôn Cent, Dafydd Llwyd ap Llywelyn ap Gruffudd, Lewis Glyn Cothi and Lewys Morganwg.

A manuscript in the hand of Evan Evans, containing mainly poetry by Bleddyn Fardd, Lewis Glyn Cothi, Goronwy Owen and others (ff. 1-49, 56-62); and a list of feast days (ff. 50-55).
This manuscript was used for the Myvyrian Archaiology of Wales, partly for text and partly for variant notes. Peniarth MS 111 seems to be the original of this manuscript. A note on f. 12 states 'Hyd yma ym tyb i yr yscrifennodd Roesser Morys allan or Llyfr Du o Gaer Vyrddin'.

A manuscript containing 'A translation of the Triads ... by Mr Lewis Morris out of Mr. Vaughan of Hengwrt's copy ...', transcribed and corrected by Ieuan Fardd, 12 October 1773 (pp. 3-47); and a list of collections of Welsh manuscripts (pp. 81-87).
The volume also includes a list of proverbs needing correction or insertion in John Davies, Mallwyd's Dictionary (pp. 50-59); a 'catalogue of the works' of Llywarch Hen, Myrddin, Taliesin and Aneirin 'out of Moses Williams's collection' (pp. 73-80); an elegy to Humphrey Llwyd, author of the Breviary of Britain, by Lewis ap Edwart (pp. 87-95); etc.