Between 1755 and 1756 he composed various articles for the Encyclopedic, and between 1757 and 1760 an article on Valeurs et monnaies, probably for the Dictionnaire du commerce of the abbe Morellet.
About the time that Buffon was bringing to an end his studies of birds, Mauduyt undertook to write the Ornithologie of the Encyclopedic methodique - a comparatively easy task, considering the recent works of his fellow-countrymen on that subject, and finished in 1784.
See the article by C. Kohler in La Grande Encyclopedic; Bibliographic du Velay (1902), 640-650.
He undoubtedly instigated D'Alembert to include a censure of the prohibition in his Encyclopedic article on "Geneva," a proceeding which provoked Rousseau's celebrated Lettre a D'Alembert sur les spectacles.
This was at once an attack on Voltaire, who was giving theatrical representations at Les Delices, on D'Alembert, who had condemned the prejudice against the stage in the Encyclopedic, and on one of the favourite amusements of the society of the day.
His articles on music in the Encyclopedic deal very superficially with the subject; and his Dictionnaire de musique (Geneva, 1767), though admirably written, is not trustworthy, either as a record of facts or as a collection of critical essays.
For the Encyclopedic he compiled and translated a large number of articles on chemistry and mineralogy, chiefly from German sources.