Leiden MS. Vossianus Chym. Q. 45. 183 folios. Paper. 196x146mm. 16th Century [before 1574.] [Collection of alchemical texts, in German.] 1. f1-23 Johannes Isaaci [Hollandi], Opus saturni. 2. f24-35v Arnold of Villanova, Rosarius [liber I.] 3. f35v-44v Thomas Capellanus, De essentiis essentiarum. 4. f45-50v Jean de Roquetaillade, De quinta essentia antimonii [Extract from the end of chapter 42 of Johannes de Rupescissa, 'De consideratione quintae essentiae'.] 5. f50v-62v De coniunctione trium elementorum cum terra rubra. 6. f63-116v Arnold of Villanova [?], Liber principis [XI capp.] 7. f118-123 Dicta philosophorum de lapide [in Latin.] 8. f122v-123 [Verse.] 9. f124-165 Lilium inter spinas. 10. f168-170 [Three recipes.] 11. f172-177v De laude antimonii.