Copy prospectus attributed to the Reverend Edward Nangle, founder of Achill Mission, seeking funding for the purchase of Achill Island from its owner, Sir Richard O'Donnell. The prospectus lists the names of the Mission's president, committee members and honorary secretary and provides an outline of the Mission's origins, its establishment in Achill in 1833, the initial difficulties experienced by its members and its many subsequent successes in converting the island's Catholic population to Protestantism. The document provides a unique insight into the philosophy of the Evangelical movement in early nineteenth-century Ireland and its use of the Irish language in the conversion process and the disharmony that existed between the Church of Ireland and the Church of Rome.

Last page of a letter from James Butler, Roman Catholic Archbishop of Cashel to an unidentified group of gentlemen, urging them to exercise their vigilance and diligence 'to extirpate vice, & plant virtue & good morels [sic] that they may gain the Celestial Reward'. The missive incorporates a letter from Ellicebeth Swift addressed 'to all & every Clergymen [sic] in Care of souls within the Dioceses of Cashel & Emly', accusing them of ill treatment and threatening to make them 'dance & gallop in sich [sic] a manner that the Munster Lass in her Prime would not catch you till you pass the post at Mitchelstown' if they do not mend their ways. The letter constitutes a rare and useful account of relations between clergymen and parishioners within the Catholic Church in the archdiocese of Cashel and Emly from the female perspective.

The collection comprises primarily letters and copies of letters by members of the Monsell family or individuals associated with them. Of particular note is a letter book kept by the shipping merchant William Monsell (P2/1/1), which contains copies of some 1,200 items of mainly business correspondence, giving a unique insight into Limerick as a maritime mercantile city in the early eighteenth century. Of equal interest is the fragment of a diary (P2/1/12) kept by his grandson, the Reverend Samuel Monsell (1743-1818), Precentor of Ardfert from 1791 to 1811, which provides an extraordinary account of the private life and innermost thoughts of a Church of Ireland clergyman struggling to stay on the path of virtue.