Leiden MS. Vossianus Chym. O. 8. 92 folios. Paper. 143x112mm. 16th Century. 1. f1-2v [Magister Martinus, Tractatus de coloribus. Fragment, incomplete at end.] 2. f2v-6r Magister Martinus, Optimum opus de lapide. 3. f6 Magister Martinus, Opus de oleo philosophorum. 4. f6v-7r Magister Martinus, Versus de arte alchimiae. 5. f11r Pseudo Raimon Lull, Opus de compositione aquae vitae (Epistula accurtationis). 6. f15r Doctrina de solis calcinacione. 7. f23v Gilbert de Landen, Opera pro lapide. 8. f27v-36r Opera de antimonio. 9. f36-41r Pseudo Raimon Lull, Epistola ad Robertum regem anglorum de anima artis transmutationis super testamentum. 10. f42-63v Pseudo Raimon Lull, Compendium animae transmutationis metallorum. 11. f70 Pseudo Thomas Aquinas, Opus. 12. f71 Augustinus Tridentinus, Opus de Rubeo. 13. f72 Opus Helisei Cisterciensis ordinis et vigilii canonici tridentini ad C. fixacionem. 14. f75v Petrus albi, Augmentum. 15. f78 Magister Ludovicus O. Carm., Opus de compositione lazuri. 16. f83v Dictum cuiusdam Philosophi. 17. f84 Franciscus de Arrimino, O.F.M., Opus de solutione.