This collection consists of letters and other papers relating to Thomas Darlington. They include two letters from Thomas Darlington, writing from Queen's College, Taunton to the Reverend Thomas Hughes in 1889; eight letters to Darlington from various correspondents, including Professor Reginald W. Phillips of Bangor, John Young Evans of Trefeca College, Professor Edward Anwyl of Aberystwyth and the Reverend J. Evans, vicar of Llangynllo, Radnorshire, mainly relating to linguistic matters, dated 1901-1902; eight letters to the Reverend Thomas Hughes from members of Darlington's family concerning his papers, dated 1922-1924.
Also includes a file of notes by Thomas Darlington on dialectical boundaries in mid Wales, etc; and an offprint of his obituary by J.L. Paton in The Eagle, June 1908.