Letter listing for 1800–1809
- Hester Lynch Piozzi [formerly Mrs Thrale; née Salusbury] to Hester Maria Elphinstone, Viscountess Keith [née Thrale], 7 March 1805
- Jacques Henri Bernardin de Saint-Pierre to Marguerite Charlotte Désirée de Saint-Pierre [née de Pelleporc], 7 March 1805
- Richard Brinsley Sheridan to Hester Jane Sheridan [née Ogle], 7 March 1805
- Richard Brinsley Sheridan to Richard Peake, 11 March 1805
- Richard Brinsley Sheridan to William Adam, 11 March 1805
- The Lord Provost, magistrates and council of Edinburgh appoint a professor of mathematics by Sir William Fettes, 1st baronet for Adam Ferguson and John Leslie, 12 March 1805
- Jean Baptiste Jame to Jacques Henri Bernardin de Saint-Pierre, 21 March 1805
- père André Morellet, abbé Morellet to Nicolas Louis François de Neufchâteau, comte de Neufchâteau, 24 March 1805
- Etienne Habost to Jacques Henri Bernardin de Saint-Pierre, 26 March 1805
- Hester Lynch Piozzi [formerly Mrs Thrale; née Salusbury] to Reverend Doctor Robert Myddelton, 27 March 1805
- Jacques Henri Bernardin de Saint-Pierre to Maximin Isnard, 28 March 1805
- David Scott to Warren Hastings, 29 March 1805
- Jacques Henri Bernardin de Saint-Pierre to Marguerite Charlotte Désirée de Saint-Pierre [née de Pelleporc], 30 March 1805
- Jacques Henri Bernardin de Saint-Pierre to Marguerite Charlotte Désirée de Saint-Pierre [née de Pelleporc], 31 March 1805 [now missing]
- Richard Brinsley Sheridan to Hester Jane Sheridan [née Ogle], 1805