This society produces Irish and Celtic manuscripts in annual volumes. Each volume contains new material and is edited by a different scholar.

“It is of high importance that the great mass of Irish literature of the sixteenth, seventeenth, and eighteenth centuries, now exposed to the risks of destruction, much of it being in the single paper transcripts, should be rendered safe and accessible in print. Much of the inner history and thought of the Irish people for the last three centuries is enshrined in these frail papers...That those who speak and read Irish, as well as those that are interested in the tongue and history of Ireland, should have trustworthy and handy texts of the standard literature of that tongue placed within their reach, is surely a laudable and moderate object” (Preface, 1899).