six years later in 1793, dufresne became a taxidermist and curator at museum d'histoire naturelle. his work included the classification and arrangement of collections of invertebrates as well as vertebrates and he visited many parts of the world on behalf of the museum. in 1802 he popularized the use of arsenical soap for preserving birds in an article in "nouveau dictionnaire d'histoire naturelle" a technique which had enabled the muséum to build the greatest collection of birds in the world.