Wolfenbüttel, Herzog-August-Bibliothek MS. Extrav. 291.1. 103 folios. Paper. 15th Century. 1. f1r Nunc dicendum est quit sit Ruchpulvis. 2. f4r De sale armoniaco. 3. 9r [Alchemical verse.] 4. 12r [Verse on Mercury.] 5. 12v Liber triginta verborum. [Subscribed 'Geber'.] 6. f21r De aquis. 7. f38r De mercurio. 8. f40v De lapide. 9. f42r Extractio Mercurii... per dominum Johannem [Hollandum?]. 10. f42v Fixatio sulphuris. 11. f43v De generatione metallorum. 12. f45r Dicta Bellini [See Singer 10.] 13. 48r Johannes Sawtre, Radix mundi. 14. f77r Hortulanus, Tertia pars de compositione lapidis [?] 15. f91r Raimon Lull. De terminis, epistula tertia. 16. f98r Ruecherus de Ummelberg [?]. Secretum. [See Singer 356.] 17. f100r De rigore verborum. 18. 102v [Verses on alchemy.]