Vienna, Österreichen Nationalbibliothek MS. 5307 [Med. 88.] 345 folios. 15th Century. 1. f1-9 'Liber utilitatis nature secretorum floridus' 2. f9-15v [Collection of diverse experiments and secrets of chemistry and alchemy especially concerning the distilling of various waters.] 5. f36 [An Interpretation of the signs and sigils and vocabulary, with which the masters of alchemy ..] 18. Johannes de Rupescissa. Tractatus de consideratione quintae essentiae omniun rerum. 25. f212v Notabilia alchymica, praesertim de terminis in alchymia usitatis.