Jean-Baptiste SAY (1767–1832). Letter from the author, 13 Germinal, to Citizen Benjamin Delessert; 1 page, in-8 format, with address. He needs to “consult the essays of the Count of Rumford, collected in two volumes, I believe. I tried to buy them at Magimel the bookseller’s, but he doesn’t have a single copy left. Do me the favor of lending me the work, which De Candolle told me you had”…