Notebooks of Robert John Pryse (Gweirydd ap Rhys), containing shelf lists of parts of his library; a list of books which he acquired from Daniel P. Jones; material for an essay ('Hanes Feirniadol Barddoniaeth Gymraeg y 18fed ganrif'); a copy of the grant of a Royal Bounty to R. J. Pryse, 1887; and a letter by M. O. Evans, Independent minister at Trefriw, 1884.

A composite volume containing transcripts by Edward Williams ('Iolo Morganwg') of Welsh poems, mainly strict-metre verse in the form of 'cywyddau', attributed to Syr Dafydd Owain, Huw Dafydd Llwyd, Ieuan ap Hywel Swrdwal, Llawdden, Dafydd Llwyd Matthew, Siôn Mowddwy, Rhobin Ddu 'o Fôn', Siôn Tudur, Syr Dafydd Llwyd Fach or Syr Dafydd Llwyd Ysgolhaig, Lewis Glyn Cothi, Huw Pennant, Rhosser Cyffin, Person Llanberis, Dafydd ap Dafydd Llwyd, Thomas Prys, Rhisierdyn, Gutto'r Glynn, Meredydd ap Rhys, Rhys Goch Glyndyfrdwy, Siôn Brwynog, Thomas Celli, Llywelyn Goch ap Meuryg Hen, Rhys Cain 'o Groes Oswallt', Rhisiart Philip, Rhys Llwyd ap Rhys ap Rhiccart, Hywel ap Syr Mathew, Gruff. Hiraethog, Edmund Prys, Arch[d]diacon Meirionydd, Gruffudd Hafren, Rowland Fychan 'o Gaer Gai', Ieuan Llwyd Sieffre, Ieuan Tew Brydydd, Owain ap Llywelyn Moel, Lewys Môn, Dafydd Pennant, Rhys Goch ap Dafydd sef Rhys Goch Eryri, Tudur Aled, Ieuan Brydydd Hir, Siôn Philip, Lewis ab Edward Bencerdd, Wiliam Cynwal, Ieuan Deulwyn, Gruffudd ap Gweflyn, Lewys Menai, Dafydd Llwyd 'o Fathafarn', Dafydd ap Hywel, Ieuan ap Gruffudd Leiaf, Huw Arwystli, Rhys ap Llywelyn ap Gruffudd ap Rhys, Guttyn Owain, Hywel Dafydd ap Ieuan ap Rhys, Iolo Goch, Ieuan Llawdden, Wiliam Llyn, Gruffudd Gryg, Dafydd Llwyd ab Einion Lyglyw (or Gruffydd Llwyd ab Dafydd ab Einion Lygliw, or Dafydd ab Gruffydd Llwyd ab Einion Lygliw), Dafydd ab Gwilym, Lewys Morganwg (or Lewys Brydydd Hodnant), Rhisiart ap Rhys Llwyd, Iorwerth Fynglwyd, Thomas Derllysg, Dafydd, Abad diweddaf Margam, Siôn y Cent, Thomas Lleison 'o Gastell Nedd', Ieuan Du'r Bilwg, Llywelyn Moel y Pantri, Rhys Llwyd ab Rhys ab Rhisiart 'o Lan Haran', Ieuan Rudd, Gruffudd ap Ieuan ap Llywelyn Fychan 'o Lannerch Llyweni', Meredydd ap Rhosser, Tudur Penllyn, Dafydd ap Edmwnd, Ieuan Brechfa, Syr Owain ap Gwilym, Bedo Hafes, Syr Rhys o Garno, Dafydd Llwyd ab Llewelyn ab Gruffydd, Llywelyn ab Guttyn, Trahaiarn Brydydd Mawr, ? Iorwerth Beli, Llywelyn Goch y Dant, Wiliam Pywel 'o Gastell Madog', Dafydd y Coed, Ieuan Môn Hen, Gruffudd ab Gronw Gethin, Meyrig Dafydd, Wiliam Byrcinsha, Syr Dafydd Trefor, Bleddyn Siôn 'o Lancarfan', Casnodyn, Syr Rhys Offeiriad, Llywelyn ap Guttyn, Ieuan Gethin ab Ieuan ab Lleison, Syr Dafydd Jones, Ficcer Llanfair Dyffryn Clwyd, Ifan Llwyd, and Siôn ap Ffelpot. There are occasional notes on the poems and poets and on the source of the transcript.

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 transcript by William Jones ('Bleddyn'), Llangollen of 'cywyddau' and 'englynion', etc. by Gwerful Mechain, Hywel Dafi [Hywel ap Dafydd ab Ieuan ap Rhys], Sion ap Philpot, Robert ap Dafydd Llwyd, Gruffudd Leiaf, Iorwerth Fynglwyd, Dafydd Llwyd ap Llywelyn ap Gruffudd, Sion ap Hywel ap Tudur, Huw Cae Llwyd, Lewis Daron, Bedo Brwynllys, Syr Rhys o Gar[no], 'Twm o'r Nant' [Thomas Edwards], 'Person Llangwm', Tudur Aled, Morys ap Hywel ap Tudur, Gruffudd Hiraethog, Huw Llwyd Cynfal, Ieuan Dew Brydydd, Dafydd ap Gwilym, Richard Cynwal, Huw Machno, Syr John [Sion] Leiaf, [Sir] Huw Pennant, Rhys Nanmor, Sion Dafydd Lâs [John Davies], Syr Dafydd Owain, Gruffudd ab Ieuan ap Llywelyn Fychan, Hywel Cilan, Sion Tudur, Lewis Môn, Hywel Gethin, Ieuan ap Gruffudd Leiaf, Watcyn ap Rhisiart, Hywel ap Rheinallt, Mathew Brwmffild, Guto'r Glyn, Watcyn Clywedog, Wiliam Llŷn, Wiliam Cynwal, Simwnt Fychan, Ieuan Llafar, Thomas Prys, William Vaughan, Huw Arwystli, Sion Phylip, Richard Phylip, Ieuan Dyfi, Lewis Menai, Rhys Goch Glyndyfrdwy, Llywelyn ap Gutun, Madog Leiaf and Ieuan ap Rhydderch, with 'englynion' by Dafydd Nanmor, Cadwaladr Ces[ai]l, Huw Ifan ap Huw ('o'r Brynbychan') and Siôn Ifan.

A notebook in the hand of David Evans, Llanrwst containing 'Y Llinell Gyntaf o bob Cerdd Cywydd a charol sydd yn yr hen Almanaciau ynghyd a henwau yr Awdwyr', i.e. a chronological list of first lines of poetry in strict and free metres published in Welsh almanacs from 1686 to 1786. The free metre poetry, 'carolau' and 'cerddi' are arranged separately under each author.

A scribbling tablet in the hand of J. H. Davies containing extracts and notes from manuscripts in the British Museum, the National Library of Wales and Cardiff Free Library and from printed sources largely on the correspondence of, and poetry by or relating to, the Morris brothers ('Morysiaid Môn'), Goronwy Owen ('o Fôn'), Evan Evans ('Ieuan Fardd') and Edward Williams ('Iolo Morganwg').

A composite volume made up of copies of Yr Odydd Cymreig, Cyf. 1 (1842), Rhif 2, 3, 4, and articles on 'Llyfrgelloedd ' (Y Traethodydd, 1858-9), 'Y Bardd o'r Nant a'i Waith' (Y Traethodydd, 1875), 'Y Bardd o'r Nant a'r Cerddi Bedydd' (Y Traethodydd, 1876), and 'Sallwyr Cymraeg', a review of Twr Dafydd: sef Salmau Dafydd wedi eu cyfaddasu ar Gân ... gan y Parchedig William Rees, Liverpool (Dinbych: Thomas Gee, 1875), followed by some miscellaneous press-cuttings.

Two composite volumes of transcripts of Welsh texts, with copious annotations, in the hand of W[illiam] H[enry] Mounsey. The titles include 'Hynafion Dyffryn Clwyd' (printed in Y Brython, 1861, pp. 325-6), 'Llyma henwau Maen mawr werthiawg, ei gwrthiau, a'i nattur', 'Llyma lyfyr a elwir Graduelys' (Y Brython, 1860, pp. 413-16), 'Rhyfeddodau Palestin', 'Y Llyfr a elwir y Purdan', 'Prophwydoliaeth Dewi Sant', 'cywyddau' and 'englynion' by Huw ap Rissiart ap D'd, Evan Evans ['Ieuan Brydydd Hir'], Tudur Penllyn, Dafydd Nanmor, Morys Kyffin, 'Llyma henwae y kyffion kler a'r kerddorion a raddiwyd pan vu yr Eisteddfod ddiwaethaf yn tref Gaerwys', 'Llyfr Kadwedigaeth Kerdd Dant', Y Kaniadau y sydd ar y Bragod Gowair (with 'Ar y Kras Goweir y maent', etc.), 'Llyma ymddiddan a vu rhwng Adrian ag Eppig', 'Llyma Ache ag ymddiddane a vu rrwng Selyf ap D'dd brophwyd a Marcholffus', 'Hen chwedl Diawl y Dwndwr' (incomplete) (Y Brython, 1860, pp. 136-7), 'Herodraeth' [i.e. Llyfr Arfau or Disgrifiad Arfau] (incomplete), 'Llyma Ddosbarth y Saith Gelfyddyd', 'Prophwydoliaeth y Bardd Cwsg', 'Prophwydoliaeth y Wennol', 'Cynghorion i amryw ddolurie' (Y Brython, 1860, pp. 339-40), 'Klod Kerdd Dafod', (see D. Gwenallt Jones 'Clod Cerdd Dafod', Llen Cymru I, pp. 186-7), 'Achau Powys' (Y Brython, 1860, pp. 124-7), 'Chronicl Cymreig' (incomplete), 'Mynachlog yr Ysbryd Glân' (Y Brython, 1860, pp. 361-5), 'Arwyddion Dydd Barn' (Y Brython, 1860, p. 56), 'Buchedd Marthin Sant', 'Llyma ystori VII doethion Ryvain (Y Brython, 1860, pp. 81-94) (with variant readings), 'Hanes Gwidw' (Y Brython, 1860, pp. 241-6), 'Arglwydd Glyndwr' (Y Brython, 1860, p.345), 'Siartrau y Waen' (Y Brython, 1861, pp. 337-9), 'Rinwedd y Ceilog' (Y Brython, 1860, pp. 56-7), 'Llyma ystori teitys vab ysbysionys' (Y Brython, 1860, pp. 41-4), 'Pa le y claddwyd y Prydyddion hyn' (Y Brython, 1860, pp. 137-8), 'Rhinweddau croen Neidr' (Y Brython, 1860, p. 137), ['Man-gofion'] (Y Brython, 1860, p. 269), etc. The majority of the transcripts are based on manuscripts in the British Museum. There are occasional annotations and references in the hand of D. Silvan Evans. The volumes are lettered respectively 'Welsh Tracts MSS W. H. Mounsey Vol. I' and 'Welsh Tracts MSS W. H. Mounsey Vol. II.'

A composite volume, the first portion of which (pp. 1-78, old foliation 1-38), written in the early eighteenth century, contains selections from Flores poetarum, triads, englynion, the divisions of Wales (pp. 29-33), cywyddau, poems in free metre, and an incomplete table of the contents of the latter portion of the volume (pp. 57-59). The second part of the volume (pp. 79-406, old foliation 1-245 with gaps) has been neatly written in two or more hands, one of the seventeenth century and the others of the early eighteenth century. It contains Welsh poems in strict and free metres from the fifteenth to the eighteenth centuries, many of them either of Anglesey interest or written by Anglesey poets, particularly Lewis Môn, Sion Brwynog and John Griffith of Llanddyfnan.
Among miscellaneous items are copies of the Articles of Agreement between the Parliamentary Commissioners and the inhabitants of Anglesey, 1648 (pp. 295-296); Sir Edward Trevor's riddle (p. 312); and a short bardic grammar (pp. 358-362).

A small group of autograph Welsh poems, mostly relating to the Wynne family, consisting of: (i) anonymous verses entitled 'Penillion cufaddas i'r amser yma ...', beginning 'Pob haden lawen lonudd su ai miwsig hud meusudd ...' (f. 1); (ii) 'Cywydd Marw-nad er coffadwriaeth am Farwolaeth Gwraig foneddigaeth sef Mrs Wyn o Fodewryd yr hon a hunodd yn yr Arglwydd y 31 o fis Awst 1723', by Robert ap Richard (ff. 2-3); (iii) 'Cowydd priodas Mr Chansaler Wyn a chroeso ir wlad', by William Morgan Lloyd, [1714] (ff. 4-5); (iv) 'Cywydd Marwnad y gwir Barchedig Dad yn Nuw Humphreu Humphres Arglwydd Esgob Henffordd', by Owen Gruffydd, [1712] (ff. 6-7); (v) a translation into Welsh of 'Of Noble Race was Shenkin' and Latin verse mainly in the autograph of Chancellor Wynne (ff. 8-9); (vi) a poem 'I'r haeddol Barchedig Mdm Margaret Humphreys', by David Manuel (f. 10); and (vii) 'Cerdd i Annerch, ynghyd a mawl ddyledus i Mr Edward Owens, o Benrhos, ar dôn a elwir Marwnad yr Helwyr', by Richard Parry (f. 11).
Also included are miscellaneous accounts, 1693-1729 (ff. 12-14, 17-18, 20), and two letters from Wm Lloyd, Kefn, to Mrs Wynne, 14 February 1712/3 (ff. 15-16), and to Dr Wynne, 28 April 1730 (ff. 19-20).

Transcripts by Robert Oliver Rees of poetry, letters, etc., by David Richards (Dafydd Ionawr) and of poetry by others relating to him and his work.

A commonplace book kept by Ioan Pedr containing a large number of notes on a variety of subjects; 'englynion', hymns and other poetry; folk- and nursery-rhymes; tales, games and anecdotes relating mainly to Bala and district; a Welsh translation of Shakespeare: Hamlet, Act I, Scene I; notes on sheep ear-marks, with examples and diagrams; lists of poems by Thomas Edwards ('Twm o'r Nant'); biographical, bibliographical and philological notes, including lists of dialect words; inscriptions and epitaphs at Llanycil church; a copy of a letter written 21 September 1828 from Delaware, U.S.A., by John Edwards ('Eos Glan Twrch') to his parents at Tynyfedw, Cynllwyd, Merioneth; etc.

Transcripts by Ioan Pedr from manuscripts of Robert Jones (Tydu, Cwmglanllafar) and John Jones ('Myrddin Fardd') of 'cerddi' and 'cywyddau' by David Jones ('Dafydd Sion Siams'), Elis Roberts, Thomas Edwards ('Twm o'r Nant'), Hugh Jones (Llangwm), John Thomas (Pentrefoelas), Rice Hughes ('o Ddinam'), Owen Gruffydd, Robin Ddu, Dafydd Gorlech, John Roger, Mor[y]s ab Ieuan ab Einion, Thomas Prys, Gruffudd Hiraethog, Siôn Tudur, Guto'r Glyn, Llywelyn Goch ap Meurig Hen, Gruffudd Gryg and Dafydd ap Gwilym.