MARAT (J.-P.). PHYSICAL RESEARCHES ON ELECTRICITY... Paris, de l'imprimerie de Clousier, 1782, in-8° of 8-467 (misprinted 461)-[3] pages, half navy blue basane (later binding). FIRST EDITION. Marat attacks the main accepted theories and describes more than 200 personal experiments, sometimes referring to Benjamin Franklin. With 5 hors-texte plates engraved on copper by Sellier showing the instruments used. Some brown spots.