 As an author he wrote about the general principles of the French language and in 1762 laid the rules of French spelling fixed, including his comments on the debate.In 1765, César Chesneau Dumarsais died, who hitherto contributed on the topic of grammar for the "Encyclopédie" by Denis Diderot.After his death, Douchet and Nicolas Beauzée - both teachers at the École Royale Militaire - took over his work.