Cambridge, University Library MS. Dd. iv. 45. 35 folios. Paper and parchment. Small 4to. 15th and16th Century. 1. [6 pages paper] 'Arnaldus de Nova Villa.' [Begins]: '[M]ateria lapidis est res vilis pretii ubicunque reperitur.' 2. [4 pages paper] 'Declaratio Lapidis Philosophorum per Avicennam Filio suo.' 3. [7 pages paper] [Anonymous tract beginning: 'Hic incipit tractatus optimus in quo exponit et apte declarat Plinius philosophus quis sit lapis Philosophicus.'] 4. [2 pages paper] [On the same subject 'per Albertum', beginning: 'Aqua Mercurius et oleum sulphuris'.] 5. [22 pages papper] [A Collection of Dicta of Hermes, Aristotle, and others, on the subject of Alchemy, but the treatise itself does not extend into the last three pages.] 6. [18 pages] [A preface and four chapters, beginning 'Lapis Aquile cum natura preciosissimus..'. At end: 'Explicit tractatus magistri Johannis de Porta Claudorum...'] 7. [18 pages of small quarto in parchment of the 15th Century.] 'Expicit tractatus de Serpente sub compendio breviloquii Holketti.'