11From Benjamin Franklin to Jan Ingenhousz, 26 April 1777 (Franklin Papers)
ALS : Henry Huntington Library I find by your Favour of the 2d Inst. that my Letter to you had...
12To 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...
13To 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...
14To 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...
15To Benjamin Franklin from Ingenhousz, 18 October 1777 (Franklin Papers)
ALS : Historical Society of Pennsylvania I rcived yesterday from Madame chaumont the lettre of...
16To Benjamin Franklin from Ingenhousz, 14 December 1777 (Franklin Papers)
ALS : University of Pennsylvania Library; AL (draft): Yale University Library You will be...
17To Benjamin Franklin from [Jan Ingenhousz], 6 March 1778 (Franklin Papers)
AL : Historical Society of Pennsylvania I recieved your kind lettre at Brussels with several...
18To Benjamin Franklin from Ingenhousz, 12 [May] 1778 (Franklin Papers)
Letterbook abstract: Gemeente-Archief, Statserf, Breda To Dr. Franklin in passy that sir john...
19To Benjamin Franklin from Ingenhousz, 14 May 1778 (Franklin Papers)
ALS : Historical Society of Pennsylvania You will have recieved my lettre of May 12th. which I...
20To Benjamin Franklin from Ingenhousz, 15 June 1778 (Franklin Papers)
ALS : Historical Society of Pennsylvania I recieved your kind lettre dated juin 8 and thank you...