Excepting occasional short absences he never left Paris. At the time of his death he was librarian of the convent in Rue Saint-Honoré, a position which he had filled almost all his life, lending assistance to those who sought information on theology and ecclesiastical antiquity. Under the supervision of Père Marsollier he mastered the classical languages, Arabic, and Hebrew, to the detriment, it seems, of his mother-tongue.[1]