Leiden MS. Vossianus Chym. Q. 21. 335 folios. Paper. 207x164mm. 16th Century [1589-95.] 1. f22-74 John of Padua, Benedictus thesaurus mundi [in German.] 2. f75v-128 John of Padua, Philosophia sacra et praxis de lapide minerali [in German.] 3. f130-148 Pseudo Raimon Lull, Epistola accurtacionis [in German.] 4. f148v-161v Henry of Prague, Trifolium novellum. 5. f162-175v Hermes, Apocalypsis. 6. f175v-180 Pseudo Roger Bacon, Speculum alchimiae. 7. f180v-182 Pseudo Roger Bacon, Compendium alchimiae. 8. f182v-184 Paracelsus, Thesaurus thesaurorum [in Latin and German.] 9. f184-193 Lilium philosophorum. 10. f193v-206v Paracelsus, Libellus de quinta essentia. 11. f206v-226v Pseudo Thomas Aquinas, De multiplicatione artis. 12. f228-311 Christopher of Paris, Elucidarius.