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...