[Letter from John O'Donovan (8 Newcomen Place, North Strand, Dublin) to William Reeves, requesting a third opinion on deciphering MacDonnell's deed, and discussing the current census and the state of the Irish language.]

[Letter from John O'Donovan (8 Newcomen Place, North Strand, Dublin) to William Reeves, discussing recent criticisms of their work on Irish place names.]

[Letter from John O'Donovan (19 St. John's Road, Oxford) to James Henthorn Todd, discussing Laud 615 and some poems of Columkille in the Bodleian Library.]

[Letter from Joannen Donovaniden [John O'Donovan] (Ulster Railway Hotel, Belfast, Co. Antrim), to William Reeves (The Vicarage, Lusk, Co. Dublin), discussing the Dinnsenchus of Armagh.]

[Letter from Sean O'Dondubhain [John O'Donovan] to an unidentified recipient, discussing a passage in the Annals of the Four Masters and various translations of it.]

[Letter from William Reeves ([Parsonage], Ballymena, Co. Antrim) to John O'Donovan, incorporating O'Donovan's response to queries.]

[Letter from J. Donnavanides [John O'Donovan] (36 Buckingham Street, Dublin) to William Reeves, concerning the young linguist Whitley Stokes.]

[Letter from John O'Donovan (36 Buckingham Street, Dublin) to William Reeves, discussing the meaning of the Irish word Drui or Drai.]

[Letter from John O'Donovan (36 Buckingham Street, Dublin) to William Reeves, discussing Scottish place names and women's names.]

[Letter from John O'Donovan (8 Newcomen Place, North Strand, Dublin) to William Reeves (11 Panton Square, Haymarket, London), discussing the state of Irish manuscripts in a number of British archives and their interpretation to date.]