Mellon Collection, Yale University Library MS. 21. 6 paper flyleaves, 40 parchment folios + 12 paper folios. 156x120mm. 15th and 18th Centuries. [Alchemical miscellany, in Latin and Italian.] 1. John of Rupescissa. De consideratione quinte essentie. 2. [Descriptions of various herbs, in Latin.] 3. [Alchemy in Latin.] 4. [Recipes for making Prussian Blue, in Italian.]