British Library MS. Sloane 2459. Parchment. Quarto. 16 folios. 15th Century. 1. 'Istae sunt tres ordines secundum Geberem'. f.1. 2. 'Tractatus Maria Prophetissae'. f.1b. Printed in Artis Aurifabrae, vol.1, Basil. Octavo, 1610 (?). 3. Processus et experimenta chymica. ff.3-9. 4. 'De proprietatibus et qualitatibus quarundam herbarum et lapidum secundum Aristotelem' - tractatulus alchemicus. [Imperfect]. ff.9b-16. Extracted from a book of Aristotle, which is entitled 'Secreta Secretorum' edit. Par. quarto, 1520. folio 36.