The scientists also tested a comparison specimen tanned according to the "English method" which soaked within hours. As M. Potot provides certificates testifying to the durability and quality of his wares, Desmarest and Montigny do not see any necessity for further scrutiny. In conclusion, the scientists confirm the importance of Potot's methods and recommend them to the Academy's recognition, government protections and promulgation. - The geologist Desmarest was famous for his contributions to Diderot's Encyclopédie. He had been elected member of the Academy of Sciences in 1771; in 1788 he was appointed inspector of the manufactories. - Well preserved with a collector's mark in pencil (recto)..