Mellon Collection, Yale University Library MS. 56. 101 folios. Paper. 195x133mm. 17th Century [c. 1640.] Michael Maier, Tripus aureus, hoc est, tres tractatus chymici selectissimi. 1. Basilius Valentinus. Practica. 2. Thomas Norton, The ordinall of alchemy [translated into Latin verse.] 3. John Cremer. Testamentum. [Illustrated with 20 coloured drawings.]