Edme MENTELLE (1730-1815), geographer. 11 L.A.S., one L.S .and one autograph manuscript, 1784-1810; 25pages in-or in-8. 2 are addressed to Panckoucke, about his work for the Encyclopédie and a manuscript attacking his opinions. - To Duclerc, professor of geography and history (2). - 2 letters about his teaching at the École centrale des Quatre Nations, accompanied by a manuscript detailing the necessary equipment: "1° Une sphère de Copernic as it has just been perfected by cit. Loisel, a mechanical engineer; this sphere is free of the circles that confuse ordinary spheres, and the earth describes an ellipse"... Etc.