1To Benjamin Franklin from Jan Ingenhousz, 15 November 1776 (Franklin Papers)
ALS : American Philosophical Society; duplicate: Staatsbibliothek Preussischer Kulturbesitz, West...
2To Benjamin Franklin from Ingenhousz, 23 June 1783 (Franklin Papers)
ALS : American Philosophical Society This is only to accompany the adjoin’d lettre of mr....
3To Benjamin Franklin from Ingenhousz, 29 April 1783 (Franklin Papers)
ALS : American Philosophical Society The bearer of this, Mr. james Robertson, being arrived at...
4To Benjamin Franklin from Ingenhousz, 1 September 1783 (Franklin Papers)
ALS : American Philosophical Society The inclosed note and bill of exchange of 150 florins on...
5To 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...
6To Benjamin Franklin from Jan Ingenhousz: Dedication, 1 November 1783 (Franklin Papers)
Printed in Nouvelles Expériences et observations sur divers objects de physique (Paris, 1785),...
7To Benjamin Franklin from Ingenhousz, 14 January 1784 (Franklin Papers)
ALS : American Philosophical Society This lettre will be delivred to you by the Countesse de...
8To 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...
9To 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...
10To 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...