1From Benjamin Franklin to Humphry Marshall, 9 July 1769 (Franklin Papers)
ALS : Mr. S. Hallock du Pont (1955) I received your obliging Favour of April 13. with Specimens of the several Colours suitable for Painting which you have found in different Parts of our Country. It gives me great Pleasure to see them, and I have shown them to many Persons of Distinction, together with your Letter, which is allow’d to contain a great many sensible and shrewd Observations....