Mellon Collection, Yale University Library MS. 14. 43 folios. Paper. 215x143mm. 15th Century [c. 1475.] [Alchemical and Humanistic Miscellany.] 1. John of Rupescissa. De consideratione quinte essentie. 2. Arnold of Villanova. Epistola de sanguine humano ad magistrum Iacobum de Toleto. 3. [Alchemical procedures.] 4. Francesco Petrarca. Epistola ad Marcum Tullium Ciceronem. 5. Pier Paolo Vergerio. Epistola in nomine Ciceronis ad Franciscum Petrarcham. 6. Johannes Obrist. Super confectionem auri potabilis. 7. Nicolaus Claudii. Opus super aurum potabile.