Leiden MS. Vossianus Chym. Q. 22. 78 folios. Paper. 204x165mm. Second half of 16th Century. 1. f1-8 Instructio de studiosis in alchimia instituendis sive figuris. 2. f9-33v Florilège alchimique [Collection of verses connected with the preceding 'Instructio'.] 3. f34-52v Rosarium Philosophorum vel Donum Dei. [Pretiotissime donum Dei.] 4. f53v-65 Florilège alchimique [Collection of verses connected with the preceding work?]