Leiden MS. Vossianus Chym. Q. 52. 199 folios. Paper. 190x154mm. 16th Century [1578-83.] I. 1. f1-60v [Valentin Weigel], Der guldene griff, 1578. 2. f61-65 [Johannes Albergius], Admonitio, 1581 [in German.] 3. f66-83v Valentin Weigel, Responsio ad admonitionem, 1583 [in German.] 4. f85-96 Valentine Weigel, Responsio alia ad admonitionem, 1583 [in German.] II. 5. f97-101 De magia [in German.] III. 6. f102-187 Liber secundus de alchemia [in German.]