Letter written by DE LALANDE Joseph Jérôme Lefrançois (1732 - 1804), French astronomer and director of the Paris Observatory, addressed to "Monsieur Gavnerin, physicist and French aeronaut in St. Petersburg" - "Au citoyen. J'epère citoyen que vous trouvez près de vous ce que vous désirez...". - 1799. Pen and ink. On laid paper (160 x 215 mm). Condition B-: Paper yellowed, perforated and folded (ASTRONOMY - SCIENCES)