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...
17Ingenhousz 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...
18To Benjamin Franklin from [Jan Ingenhousz], 6 March 1778 (Franklin Papers)
AL : Historical Society of Pennsylvania I recieved your kind lettre at Brussels with several...
19To Benjamin Franklin from Ingenhousz, 12 [May] 1778 (Franklin Papers)
Letterbook abstract: Gemeente-Archief, Statserf, Breda To Dr. Franklin in passy that sir john...
20To 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...
21To 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...
22To 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...
23To 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...
24To Benjamin Franklin from Jan Ingenhousz, 1 April 1779 (Franklin Papers)
Letterbook abstract: Gemeente-Archief, Statserf, Breda a Franklin , que le volume des Trans....
25To 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...
26From 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...
27To 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...
28To 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...
29From 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...
30To 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...
31To 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...
32To Benjamin Franklin from Jan Ingenhousz, 7 February 1781 (Franklin Papers)
ALS : American Philosophical Society I wrote you a lettre some weaks ago containing an account of...
33To Benjamin Franklin from Ingenhousz, 7 April 1781 (Franklin Papers)
ALS : American Philosophical Society I did send you in Decembre last the issue of the experiment...
34To 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...
35To Benjamin Franklin from Ingenhousz, 29 August 1781 (Franklin Papers)
ALS : American Philosophical Society Give me leave to acquaint you, that I wrote an other letter...
36From Benjamin Franklin to Ingenhousz, 2 October 1781[–21 June 1782] (Franklin Papers)
AL (draft) and LS : Library of Congress It is a long time, my dear Friend, since I have had the...
37To Benjamin Franklin from Jan Ingenhousz, 8 December 1781 (Franklin Papers)
ALS : American Philosophical Society I Can make no doubt but my lettres came all to hand dated...
38To Benjamin Franklin from Jan Ingenhousz, 24 April 1782 (Franklin Papers)
ALS : American Philosophical Society When you consider, how long time I had the honour of...
39To Benjamin Franklin from Ingenhousz, 12 June 1782 (Franklin Papers)
ALS : American Philosophical Society I hope you have recieved in du time my last dated april 24...
40From Benjamin Franklin to Ingenhousz, [21 June 1782] (Franklin Papers)
AL (draft), press copy of L , and copy: Library of Congress An Attempt to explain the Effects of...
41To Benjamin Franklin from Jan Ingenhousz, 20 August 1782 (Franklin Papers)
ALS : American Philosophical Society I Was very happy in recieving your lettre containing the...
42To Benjamin Franklin from Ingenhousz, 2 October 1782 (Franklin Papers)
ALS : American Philosophical Society I got at last an account of Pere Barletti’s pamphlet in an...
43To Benjamin Franklin from Ingenhousz, 27 November 1782 (Franklin Papers)
ALS : American Philosophical Society I have at last recieved the German American newspapers as...
44To Benjamin Franklin from Ingenhousz, 29 November 1782 (Franklin Papers)
ALS : American Philosophical Society Yesterday I was favoured with your kind lettre dated Nov....
45To Benjamin Franklin from Jan Ingenhousz, 28 January 1783 (Franklin Papers)
ALS : American Philosophical Society As I expected every day to hear that peace was actualy made,...
46To Benjamin Franklin from Ingenhousz, 26 February 1783 (Franklin Papers)
ALS : American Philosophical Society You will have recieved my last, by which I asked you leave...
47To Benjamin Franklin from Ingenhousz, 8 April 1783 (Franklin Papers)
ALS : American Philosophical Society As I have not heard from you this long while, I wish to know...
48To Benjamin Franklin from Ingenhousz, 29 April 1783 (Franklin Papers)
ALS : American Philosophical Society The bearer of this, Mr. james Robertson, being arrived at...
49From Benjamin Franklin to Jan Ingenhousz, 16 May 1783 (Franklin Papers)
LS and incomplete AL (draft): Library of Congress I have before me your three Favours of Feby....
50From Benjamin Franklin to Ingenhousz, 1 June 1783 (Franklin Papers)
ALS : American Philosophical Society This will be delivered to you by an ingenious young Friend...