1From Benjamin Franklin to Jan Ingenhousz, 30 September 1773 (Franklin Papers)
ALS (letterbook draft): American Philosophical Society I rejoic’d as much as any Friend could do,...
2To Benjamin Franklin from Jan Ingenhousz, [24 February 1774]: abstract (Franklin Papers)
Abstract: Ingenhousz letterbook, Gemeente-Archief, Breda I am in the utmost consternation about...
3From Benjamin Franklin to Jan Ingenhousz, 18 March 1774 (Franklin Papers)
ALS : Harvard University Library I have lately been favoured with yours of the 24th past. I am...
4To Benjamin Franklin from Jan Ingenhousz, [12 May 1774] (Franklin Papers)
Abstract: Ingenhousz letterbook, Gemeente-Archief, Breda, Netherlands I begg him send me soon his...
5To Benjamin Franklin from Jan Ingenhousz, 24 October 1774 (Franklin Papers)
Abstract: Ingenhousz letterbook, Gemeente-Archief, Breda That every body here expects his...
6To Benjamin Franklin from Jan Ingenhousz, 15 November 1776 (Franklin Papers)
ALS : American Philosophical Society; duplicate: Staatsbibliothek Preussischer Kulturbesitz, West...
7To 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...
8To 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...
9From Benjamin Franklin to Jan Ingenhousz, 12 February[–6 March 1777] (Franklin Papers)
ALS : Yale University Library; incomplete draft and copy: Library of Congress I received your...
10To 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...
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...
21To Benjamin Franklin from Jan Ingenhousz, 5 October 1778 (Franklin Papers)
ALS : American Philosophical Society You will be surprised, that I did not keep my word or...
22To Benjamin Franklin from Jan Ingenhousz, 14 November 1778 (Franklin Papers)
ALS : American Philosophical Society As I was not able to finish as soon as I expected the book I...
23To Benjamin Franklin from Jan Ingenhousz, 1 April 1779 (Franklin Papers)
Letterbook abstract: Gemeente-Archief, Statserf, Breda a Franklin , que le volume des Trans....
24To Benjamin Franklin from Ingenhousz, 9 April 1779 (Franklin Papers)
ALS : American Philosophical Society Since my last of last weak I saw your old femal friend in...
25From Benjamin Franklin to Ingenhousz, 4[–5] May 1779 (Franklin Papers)
LS : American Philosophical Society I received your kind Letter of last Month, and I forwarded...
26To Benjamin Franklin from Ingenhousz, 25 May 1779 (Franklin Papers)
ALS : American Philosophical Society I reciev’d your lettre of the 4 of May and thank you for the...
27To Benjamin Franklin from Jan Ingenhousz, 18 November 1779 (Franklin Papers)
ALS : American Philosophical Society I find myself very happy to be in a country, from which I...
28From Benjamin Franklin to Ingenhousz, 22 November 1779 (Franklin Papers)
Copy: Library of Congress I received yours of the 18th. and see with great Pleasure that you have...
29To Benjamin Franklin from Jan Ingenhousz, 3 May 1780 (Franklin Papers)
ALS : Library of Congress I hope you are not so entirely involved in the troublesome business of...
30To Benjamin Franklin from Jan Ingenhousz, 5 December 1780 (Franklin Papers)
ALS : American Philosophical Society I had the satisfaction of being informed by a lettre of...