The file comprises letters, 1829-1862, relating mainly to the Rev. John Jones's relationship with the congregation at Pantydefaid chapel, parish of Llandysul; the opening of a school by John Jones; Yr Ymofynydd; and Unitarian matters and doctrines. One letter to the Rev. O. Evans, Cefn, is also included.

The file comprises letters, 1829-1851, relating mainly to the cause at Pantydefaid chapel, parish of Llandysul and John Jones's relationship with the congregation; John Jones's school at Cribyn and the Unitarian cause in the Neath area.