1To Benjamin Franklin from Jan Ingenhousz, 15 November 1776 (Franklin Papers)
ALS : American Philosophical Society; duplicate: Staatsbibliothek Preussischer Kulturbesitz, West...
2To Benjamin Franklin from Jan Ingenhousz, 4 January 1777 (Franklin Papers)
ALS : American Philosophical Society A little time ago I sent you a lettre by the way of London...
3To Benjamin Franklin from Jan Ingenhousz, 29 January 1777 (Franklin Papers)
ALS : American Philosophical Society As I recieved my lettre Directed to you at Philadelphia back...
4To Benjamin Franklin from Jan Ingenhousz, 2 April 1777 (Franklin Papers)
ALS : American Philosophical Society I recieved a note from the post office of Paris, that a...
5To Benjamin Franklin from Jan Ingenhousz, 28 June 1777 (Franklin Papers)
ALS : American Philosophical Society It seems all your lettres miscarry in a certain way. Your...
6To Benjamin Franklin from Jan Ingenhousz, 26 August 1777 (Franklin Papers)
ALS : American Philosophical Society I Stay’d a day longer in the Country as I had proposed. I...
7To Benjamin Franklin from Jan Ingenhousz, 30 August 1777 (Franklin Papers)
ALS : American Philosophical Society I found a coach, very easy and very strong, which can keep 4...
8To Benjamin Franklin from Ingenhousz, 18 October 1777 (Franklin Papers)
ALS : Historical Society of Pennsylvania I rcived yesterday from Madame chaumont the lettre of...
9To Benjamin Franklin from Ingenhousz, 14 December 1777 (Franklin Papers)
ALS : University of Pennsylvania Library; AL (draft): Yale University Library You will be...
10Ingenhousz to Baron von Pichler, 29 December 1777: Extract (Franklin Papers)
Extracted from AL (draft): Yale University Library This letter paraphrases what must have been a...