 He wrote prefaces for volumes IX to XXVI.He was also Secretary of Michel Le Tellier and confessor to the son of the regent in 1729.Du Halde is also the author of writings in Latin as well as a treatise entitled "Le Sage chrétien, ou les Principes de la vraie sagesse, pour se conduire chrétiennement dans le monde" (The Christian Sage, or the principles of true wisdom, to lead a Christian in the world), published in 1724.