Letters to Owen Jones (1833-99) from the following correspondents: W. James, Aberdare, 1873 (2) (his decision regarding a call from Catherine Street church, Liverpool), Edward Jerman, Wrexham, 1868-9 (2) (about signing an address for presentation to Mr Parry), W[illia]m John, Bridgend, 1870 (2) (accepting an invitation to preach at Tabernacl chapel, Ffestiniog), David Jones, Festiniog and Crown Slate Quarry nr Dolgellau, 1853-72 (4, one of which is incomplete) (a choral work, he has heard that John Jones, Llwyn'r Odyn and the addressee are going to be preachers, the writer's brother Hugh, anxiety about moving the College from Bala to Chester, trying to persuade the addressee not to leave Festiniog [sic]), D. Lloyd Jones, Llanidloes, undated (1) (the whereabouts of Edward Morgan), Eben[eze]r Jones, Abergynolwyn, [18]66 (1) (affairs in connection with the Monthly Meeting and the new chapel, etc.), Edw[ard] Jones, Trewythen, 1897 (1) (acknowledging a letter of sympathy), Evan Jones, Dyffryn and Caerynarfon, 1875-6 (2) (Y Goleuad), Francis Jones [?Abergele], London, 1885 (1) (a request for statistics), Hugh Jones, Festiniog and London, 1853-72 (15, some undated) (references to Bala College, mention of an election, Y Traethodydd, the quarrel with Mr Morgan, etc.), J. Jones, Runcorn, undated (2) (the cause at Widnes), John Jones, Aberkin, 1866 (1) (his inability to come to Tabernacl), John Jones, Ysgoldy Pencaenewydd, 1870 (1) (why he failed to come the previous Sunday), J. Cynddylan Jones, Whitchurch nr Cardiff, [18]85 (2) (the committee in London, mention of Mr Lundie), J. Eiddon Jones, Llanrug, 1891 (1) (a request in connection with the writer's daughter), J. Foulkes Jones, Machynlleth, 1876 (1) (the 'Book Committee', the writer's health), Joseph Jones, Menai Bridge, 1871-4 (2) (the date of a preaching engagement, is sending copies of last year's report on the English Fund, the addressee having been appointed collector in Liverpool), N. Cynhafal Jones, Llanidloes, 1885-6 (2) (the works of William Williams, Pantycelyn), Owen Jones, Llandudno, to Mr J. O. Jones, undated (1) (the reason for his failure to come to the Easter preaching meeting), P. W. Jones, British & Foreign Sailors' Society, Barrow in Furness, 1868 (1) (asking whether an application on behalf of 'Seamen's Mission' would be responded to in the addressee's district), Peter Jones, Llanllechid, 1871 (1) (interest on C.M. chapel debts), Rees Jones, Felinheli, 1866 (1) (his inability to come to Bethesda chapel), Richard Jones, Edinburgh, [18]72 (2) (asking for and acknowledging receipt of a letter of recommendation to join Dr Candlish's congregation), Robert Jones, Rotherhithe, 1876 (1) (the addressee's subscription for the edition of Goronwy Owen), T[homas] J[erman] Jones, Witton Park, Darlington, 1864 (3) (the locality, his ministry, Cofiant Dafydd Rolant, etc.), Tho[ma]s J. Jones, Dolybont, nr Talybont, undated (1) (arrangements for a journey), and W. Jones, Oswestry, 1864 (1) (hoping to meet the addressee at Conway to continue the journey together).

The letters, 1907-1926, relate primarily to their author's researches and writings, many concerning the Trevecka Manuscripts. Many arrange meetings of 'Pwyllgor Llawysgrifau Trevecka' and discuss the publication of the Journal and the Newsletter of the Calvinistic Methodist Historical Society.

Correspondence, 1893-8, relating to the Calvinistic Methodist Church of Wales Loan Fund.