25. The works to which Diderot refers are most probably John Harris (1667?–1719), Lexicon technicum, or an Universal English Dictionary of Arts and Sciences (2 vols.; London, 1736), fifth edition; Thomas Corneille (1625–1709), Le Dictionnaire des arts et des sciences (2 vols.; Paris, 1731); and Jacques Savary-Desbruslons, Dictionnaire universal de commerce (3 vols.; Paris, 1723–1730). I am indebted to Professor Jacques Proust for his advice on this question. His article “La Documentation technique de Diderot dans l’ Encyclopédie,” Revue d’histoire littéraire de la France, LVII (1957), 335–52, has the most complete bibliography of sources for Diderot’s technical articles. Charles C. Gillispie has published a splendid selection of the plates under the title, A Diderot Pictorial Encyclopedia of Trades and Industry (2 vols.; New York, 1959).


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