Table of Contents

Advertisement concerning this fourth edition; Preface to the first edition; Letters I-V; Additional papers, 1749; Letters VI-XIII; Remarks on the Abbe Nollet's letters on electricity, by Mr David Colden of New-York; Electrical experiments together with some observations on thunder-clouds, in further confirmation of Mr Franklin's observations on the positive and negative electrical state of the clouds, by John Canton, M.A. and F.R.S.; Electrical and other philosophical papers and letters; Letters XIV-XXIII; Accounts of water-spouts; An account of the new-invented Pensylvanian fire-places; Letters XXIV-LXI; Index.

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This 1769 work brings together published and unpublished letters both from and to Benjamin Franklin, on scientific and other topics.