The letters and papers include copies of Charles Grant's correspondence, 1780-1785, with an unidentified lady (Adelaide de R-, who later became a countess) with whom he had an affair; part of his diary kept while travelling in Normandy and Brittany in 1780 (folio 26); a long letter, recounting his family history and memoirs, 1785 (folio 165); and miscellaneous letters concerning his career.