Leiden MS. Vossianus Chym. Q. 38. 168 folios. Paper. 206x156mm. 16th Century [1593.] [Karl Widemann, Collection of short chemical-theological works.] 1. f1-41v [Copies, in German, of letters on diverse matters concerning the natural and supernatural sciences.] 2. f43-65 [Extracts, in German, from the writings of Bartholomeus Korndörffer.] 3. f65-66 Hieronymus Kassler, [An account of the acquisition of an alchemical mirror, with an example from the book 'Speculum' of Theophrastus Paracelsus.] 4. f66-67, 69 [Remarks by Friedrich Gundtter to Hieronymus Kassler remarks on the 'Speculum'.] 5. f69v-70v [Observations, in German, by Gregorius Behaim to Hieronymus Kassler on the same 'Speculum.'] 6. f70v-76v [Gotthardt Pelts to Erasmus Rubeus, 26 March, 1589, concerning the material and preparation of the philosophical stone, the one true and universal medicine, in German.] 7. f77v-94v De serpentibus et aliis secretis [in German.] 8. f103v-138v Descriptio Magiae, Alchmiae et medicinae [in German.] 9. f138v-151v Paracelsus, Speculul sive lumen naturale [in German.]