In his 1397 book Traité de l'état, science et pratique de l'art de la Bergerie (Account of the state, science and practice of the art of shepherding), wrote the first description of a trematode endoparasite, the sheep liver fluke Fasciola hepatica.
In his 1397 book Traité de l'état, science et, pratique de l'art de la Bergerie (Account of the state science and practice of the art of shepherding) wrote the first description of a trematode endoparasite the sheep liver fluke Fasciola hepatica