This group reflects the varied activities of the Cymmrodorion: erecting memorials for eminent Welsh figures; publishing scholarly works of Welsh interest; arranging the annual dinner and other functions; newspaper reports of Cymmrodorion meetings and other events; notes of Cymmrodorion lectures and addresses; and addresses conneceted with special occasions.

This series comprises lectures and addresses given before the Society, written in the hand of the authors (although some are typewritten). The subjects of the lectures and addresses are all related to Wales. It appears that these particular lectures were not published.

The group comprises the secretary's incoming correspondence, 1881-1996, draft outgoing letters and circulars, 1873-1934, the secretary's subject files, 1876-1958, and papers relating to membership, 1873-1933. Most of this group belongs to the period when Sir E. Vincent Evans was secretary of the Cymmrodorion between 1887 and 1934.