Manchester, John Rylands Library MS. 405. [R.66023]. 169 folios. Paper. 15th and 17th Century. 1. f9-35v Johannes de Rupescissa (Jean de Roquetaillade), Liber de Famulatu Philosophie [or] Liber de Consideracione Quinte Essencie. [15th Century.] 2. f36-80v Hic incipitur liber qui vocatur Thesaurum Mundi. Modo dicam quomodo sit multiplicatio medicinarum ad album. [Various alchemical formulae, etc., in English and Latin. 15th Century.] 3. f1-2, 81-4, 88v-108v [Miscellaneous alchemical formulae and extracts of 17th Century.]