He laboured with Anne-Marie de Mailla and Jean-Baptiste Régis on the mapping of the provinces of Ho-nan, Kiang-nan, Che-kiang and Fu-kien (cfr. Du Halde, "Description de la Chine", The Hague, 1736, I, pref., xliii; and Richthofen, "China," Berlin, 1877, I, 682).
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When the Kangxi Emperor entrusted the Jesuit missionaries with the cartographical survey of his empire, the provinces of Henan, Zhejiang, and Fujian, and the Island of Formosa, fell to the lot of Mailla along with Jean-Baptiste Régis and Roman Hinderer.