1To Benjamin Franklin from John Mitchell, [March 1745?] (Franklin Papers)
MS not found; reprinted from The American Medical and Philosophical Register; or Annals of Medicine, Natural History, Agriculture, and the Arts , IV (1814), 383–7. In the short account of the yellow fever, which I left with you at Philadelphia, I have not endeavoured to establish any theory, or even to make any deductions from any established theory of that, or like diseases; but have only...
2To Benjamin Franklin from John Mitchell, 12 September 1745 (Franklin Papers)
ALS : New-York Historical Society I was surprised to see yours of Jun. 15th. come to my hands only by last Post. What I then received by it from Dr. Colden, I suppose I owe to you; for which I am sorry I can make no other acknowledgement but thanks. I perceive likewise, that you are desirous (if I am not mistaken), that the small Paper I left with you on the yellow fever should come forth. I...
3From Benjamin Franklin to John Mitchell, 29 April 1749 (Franklin Papers)
Copy: American Academy of Arts and Sciences Observations and Suppositions towards forming a new Hypothesis for explaining the several Phaenomena of Thunder Gusts. §1. Non-Electrical Bodies, that have Electric Fire thrown into [or on] them, will retain it, ’till other Non-electrics, that have less, approach; and then ’tis communicated by a Snap, and becomes equally divided. §2. Electrical Fire...