His principal work, however, is the famous "Spicilegium, sive Collectio veterum aliquot scriptorum qui in Galliae bibliothecis, maxime Benedictinorum, latuerunt" (Paris, 1655–1677), continued by Baluze and Martène, to whom we owe an enlarged and improved edition (Paris, 1723).
Od leta 1939 do smrti je bil predavatelj.