He did not, however, confine himself to economic history.
His Le Père Joseph et Richelieu (1894), though somewhat frigid and severe, is based on a mass of unpublished information, and shows remarkable psychologic grasp.
In 1878 his Journal parisien de Jean de Maupoint, prieur de Sainte-Catherine-de-la-Couture was published in vol.
He wrote numerous articles in the Revue historique (of which he was co-director with Gabriel Monod for some years) and in other learned reviews, such as the Revue des questions historiques and the Journal des savants.