supposed chemical forgeries." The Scientific Monthly 16 (1923): 318-25. Telle, Joachim. "Bonus, Petrus, (Pietro Bono (Buono), Petrus Ferrariensis, Bonus Lombardus Ferrariensis) Mediziner und Alchemist (14. Jahrhundert)." In Lexikon des Mittelalters, vol. 2. 1983. External links Othmer MS 3 Pretiosa margarita novella at OPenn Complete downloadable scan of a Pretiosa margarita novella manuscript from the Science History Institute 14th-century alchemists 14th-century Italian writers Italian alchemists