Leiden MS. Vossianus Chym. Q. 4. 63 folios. Paper. 228x160mm. Second half of 16th Century. 1. f1-58v Paracelsus, De natura rerum naturalium [in German.] 2. f59 Paracelsus, Buch vom langen leben [in German.] 3. f60-63 [Extracts from a treatise in German on the method of making the Venice crystal.]