Manchu language
When he was fifty years old he began the study of the Manchu language, and made such progress that he was able to translate into French the "Thoung-kian-kang-mou" (), Zhu Xi's extract from the great Chinese annals, which on the orders of the Kangxi Emperor had been translated into the Manchu language. He finished the translation in several volumes in the year 1730, and in 1737 sent it to France, where it lay for thirty years in the library of the college at Lyon, Fréret, who purposed publishing it, having died.