1To Benjamin Franklin from Jan Ingenhousz, 23 May 1781 (Franklin Papers)
ALS : American Philosophical Society After having longed such a long while for an answer upon my lettres of Dec. 2. febr. 7 and april. 7th. I recieve at last a lettre from Dr. le Begue de Presle dated paris May 1. by which I am acquainted that you are well and that you have answerd me upon my lettres , tho I have recieved none at all. This lettre of mr. le Begue was shut in a cover, which had...