Leiden MS. Vossianus Chym. F. 18. 391 folios. Paper. 310x200mm. 16th Century. 1. f1-47 Pseudo Albertus Magnus, De alchymia libellus ou Semita recta [in German.] 2. f47v-53v Vididerius, Summa clavium artis alchymiae [in German.] 3. f54-82 Roger Bacon, Breve breviarum [in German.] 4. f83-108v Rases, Alchimia [in German.] 5. f109-279 [Various diverse preparations, in German.] 6. f280-281v Hans Jenitz: publie une attestation, délivrée par plusieurs notabilités de Sankt Joachimstadt en faveur des réussites alchimiques, surtout en matière d'arsenic, de feu Davidt Beutter [David Beuther.] 7. f282-322 Hans Jenitz [description of alchemical processes concerning fire of David Beuther.] 8. f323 [Letter from Gabriel Ortell to the Elector of Saxony on the verity of the processes with fire of David Beuther.] 9. f325v-348v [Various diverse preparations, in German.] 10.f349-357v Hortulanus, [Commentary on the Tabula Smaragdina, in Latin.] 11. f357v-372 Descriptio lapidis philosophorum [in German.] 12. f372 [Extract in Latin, from Denis Zachaire.] 13. f373-374 Enigmata de tinctura [in German and Latin.]