“ Of these the Études sur la condition de la classe agricole et l’état de l’agriculture en Normandie au moyen âge (1851) , condensing an enormous mass of facts drawn from the local archives, was reprinted in 1905 without change, and remains authoritative. ”

“ The jubilee of his fifty years’ association with the Bibliothèque Nationale was celebrated on the 8th of March 1903. After his retirement (February 21, 1905) he brought out in two volumes a catalogue and description of the printed books and MSS. in the Musée Condé at Chantilly, left by the duc d’Aumale to the French Institute. He produced many valuable official reports and catalogues and a great number of memoirs and monographs on points connected with palaeography and the study of history and archaeology (see his Mélanges de paléographie et de bibliographie (1880) with atlas ”