Jean-Baptiste SAY (1767–1832), industrialist and economist. Letter written by the author as director of *La Décade*, Paris, 27 Nivôse Year III (January 16, 1795), to Citizen Louis Cotte, meteorological observer at “Mont-Emile, formerly Montmorency”; 1 page, quarto, addressed. “The Observatory has continued to send me its meteorological observations despite the reasons I had to believe it would not. I will continue to publish them since I have started. This will not prevent you from receiving the issues of *La Décade* as usual; my aim in doing so is to ensure that you maintain your goodwill toward me for when I may need it”… Certificate of cultural property attached.