1To Benjamin Franklin from Benjamin Rush, 14 October 1770 (Franklin Papers)
ALS : University of Pennsylvania The many Advantages which I derived from your Friendship Whilst in London have emboldened me to take the Liberty of recommending to your friendly Notice the Bearer of this Letter——my Brother who proposes to spend two Years in the Temple in Order to finish his studies in the Law. The Civilities you confer upon him will add greatly to the very many Obligations...
2To Benjamin Franklin from Benjamin Rush, 1 May 1773 (Franklin Papers)
ALS : American Philosophical Society I am much Obliged to you for Dr. Priestley’s Experiments. They have thrown a good deal of Light upon the subject of fixed Air, Altho’ I can by no means assent to some of his inferences from them. The Experiment made with a Sprig of mint extends our Ideas of the Oconomy of Vegetables. But is all the fixed Air which is discharged from its various sources...
3To Benjamin Franklin from Benjamin Rush, [after 15 September 1773] (Franklin Papers)
AL (incomplete): American Philosophical Society I acknowledge myself much indebted to you for the Instruction contained in your last Letter. I have met with many Facts which confirm your Opinion of the Origin of Catarhs from Cloaths, Beds, Books &c. Baron Van Swieten in his last Volume of Commentaries on Dr. Boerhave’s Aphorisms in treating upon Epidemic Diseases mentions with Astonishment a...