833300 Philosophical Mercury (vellum) by Italian School, (15th century); 12.8x9.8 cm; Free Library of Philadelphia; (add.info.: Because these symbols were generally used by alchemical writers and because there is no surviving text, it is unclear which text these miniatures illustrated, although it has been suggested that they once belonged to a copy of the Rosarium philosophorum, attributed to Arnald of Villanova (ca. 1240 - 1311).); 穢 Free Library of Philadelphia ; Italian, out of copyright.