Autograph letter signed to his mother-in-law, the president of Montreuil. (Dungeon of Vincennes, May 25, 1778); 3 pages in-4°. Beautiful letter before his transfer to Aix-en-Provence to be tried, where resentment against his mother-in-law, Madame de Montreuil, is mixed, but also pity and hope of emerging with dignity from this infamous trial