FRANKLIN, Benjamin. Experiments and Observations on Electricity. Made at Philadelphia in America by Mr. Benjamin Franklin, & communicated in several Letters to Mr. P. Collinson of the Royal Society of London. Translated from the English. Paris: Chez Durand, 1756. Second edition, revised, corrected & increased with a considerable Supplement by the same Author, with Notes & New Experiments by M. D'Alibard, 2 volumes in-12; T.I: [vi], 28p. (Avertissement), xc (Histoire abrégée de l'Electricité), [12p. Preface of the English editor], 245p. 1 folding plate. T.II: [ii], 349p, [1p. errors to be corrected], 1 folding plate. Contemporary binding in speckled calf, spine ribbed and decorated, marbled endpapers, red edges. Lacks of leather on the upper cover of each volume, one cap torn off and an accident at the foot of a bit, but very fresh inside. Attached: a copy of the first edition of the same work (Durand 1752, in one volume), in poor condition: very worn binding, missing the plate, tears and soiling.