This is a collection of drafts of letters written by Dutour to Abbé Jean Antoine Nollet. Dutour describes his various experiments on the influence of flame on electricity, as well as with luminous barometers. There is information relative to eighteenth-century scientific apparatus, as well as to contemporary scientists, such as Giambatista Beccaria, Francois de Cisternay Du fay, Dortous de Mairan, Petrus von Musschenbroek, and René Antoine Ferchault de Réaumur.