Concerning company business and related matters. Letters from his son-in-law, James Antoine Bidermann (1790-1865) were written from various places visited by Bidermann while on company business, and include: references to his search for saltpetre in Kentucky; the submission of Spanish colonies in South America to King Ferdinand VII, and the consequent lessening of need for the publication of du Pont de Nemours' treatise, "Memoire aux Republiques equinoxiales;" the failure of company agents, Ridgway & Balch; false hopes for sale of Du Pont powder to Baltimore brokers for shipment to South America, and the effect upon the Du Pont mills; competition with British powder in the New York market, forcing a lowering in price; E.I. du Pont's hopes for powder orders from the Navy Department; the tannery of A. Cardon & Co.; settlement with Madame Bureaux de Pusy. Also a letter from Madame Bureaux de Pusy and one from Jacques Antoine Bidermann, of Paris; and a note regarding Madame Bureaux de Pusy's suit against E.I. du Pont and others, and a note regarding the heirs of Jacques Antoine Bidermann, of Paris, signed by E.I. du Pont, together with a copy of the inventory of E.I. du Pont de Nemours & Co., 1828, being a duplicate of one reported in above file.