[Letter from John O'Donovan (36 Buckingham Street, Dublin) to William Reeves, concerning the Life of Patrick.]

[Letter from John O'Donovan (8 Newcomen Place, North Strand, Dublin) to William Reeves (Parsonage House, Ballymena, Co. Antrim), discussing his work and his impending move to Belfast.]

[Letter from John O'Donovan (47 Essex Street, Dublin) to George Petrie (21 Great Charles Street, Dublin), discussing the meaning of some Irish words, as well as Cormac Mac Cullenan's will.]

[Letter from John O'Donovan (36 Buckingham Street, Dublin) to William Reeves, concerning Count Charles MacDonnell's letter.]

[Letter from John O'Donovan (36 Buckingham Street, Dublin) to William Reeves, asking for financial advice.]

[Letter from John O'Donovan (36 Buckingham Street, Dublin) to William Reeves, discussing translation work of Irish manuscripts.]

[Letter from John O'Donovan (8 Newcomen Place, North Strand, Dublin) to William Reeves (Parsonage, Ballymena, Co. Antrim), enclosing some answers to queries, and discussing John O'Neill's genealogy.]

[Two letters and two notes from John O'Donovan (36 Buckingham Street, Dublin) to William Reeves, discussing the identity of Berichter according to the Irish annals, and generally highlighting the importance of antiquarian studies.]

[Letter from John O'Donovan (8 Newcomen Place, North Strand, Dublin) to William Reeves, discussing the locality of Castle Drumtarsy.]

[Letter from William Reeves (London) to John O'Donovan; includes O'Donovan's response, discussing an old manuscript of Adamnan.]