Leiden MS. Vossianus Chym. F. 11. 286 folios. Paper. 310x200mm. End of 16th Century. 1. f1-48 Tractatus de alchimia [in German.] 2. f48v-99v [Chemical processes in German.] 3. f99v-103v Opus XII mensium labore constans [in German.] 4. f103v-142v [Chemical processes in German continued.] 5. f142v-144v Receptum secretum [in German.] 6. f144v-158 Tres ordines perfectionis metallorum [in German.] 7. f158v-180 De operationibus secundum philosophos [in German.] 8. f180-189 Secretum artis [in German.] 9. f189-215 Liber de mineralibus in Burgell [in German.] 10. f215v-229 Isaac, De proiectione. [in German.] 11. f229-235, 254-282 [Chemical processes in German.] 12. f235v-254 Theorica von der dritten ordnung des Elixirs [in German.]