Vatican, Biblioteca Apostolica Vaticana MS. Lat. 4092. Parchment and paper. 215x295mm. Late 14th or early 15th Century. 1. f1-8 [Albertus Magnus, Semita recta.] 2. f8-17 Roger Bacon. Breve breviarum. Liber fratris Rogerii Baconi de naturis metallorum et transforatione ipsorum. 3. f17-19 Albertus Magnus. Tractatus Alberti Magni ad literam in libro Metaurorum.. 4. f19-80 [Arnoldus?] Liber perfecti magisterii et primo racio huius artis... 5. f80-84 Incipit doctrina magistri Leonardi de reductionibus corporum calcinatis. 6. f85v-182r [Recipes.] 7. f183-191 Incipit liber fratris Helie intitulatus Vade mecum. 8. f191-197 Incipit liber pietatis notabilia [Sometimes ascribed to Pseudo-Aristotle.] 9. f197-282 [Recipes.] 10. f282v-283v[Recipes, some in Italian.] 11. f284-291v Synonyma alkimie Aer ventus, aqua liquor, adeps est illud... 12. f292-