41From Benjamin Franklin to Peter Collinson, 14 August 1747 (Franklin Papers)
ALS : Pierpont Morgan Library I have lately written two long Letters to you on the Subject of...
42From Benjamin Franklin to Peter Collinson, 28 July 1747 (Franklin Papers)
Copy: American Academy of Arts and Sciences The inclosed is a Copy of my last, which went by the...
43From Benjamin Franklin to Peter Collinson, 25 May 1747 (Franklin Papers)
Copy: American Academy of Arts and Sciences In my last I informed you that In pursuing our...
44From Benjamin Franklin to Peter Collinson, 28 March 1747 (Franklin Papers)
MS not found; reprinted from extract in Benjamin Franklin, Experiments and Observations on...
45Joseph Breintnall to Peter Collinson, 7 November 1732 (Franklin Papers)
ALS : British Museum; also MS Minute Book: Library Company of Philadelphia Your Goodness in...