British Library MS. Sloane 976. Paper. Quarto. 151 folios. 15th Century. 1. f1 Liber de praeparationibus [a collection of alchymical and chymical processes and receipts; in English and Latin.] 2. f84v Johannis de Mehum tractatus de lapide minerali et de lapide vegetabili; duobus libris comprehensus. [Begins: 'Alkymia sic diffinitur in libro qui Lylium appellatur'. Ends: 'Explicit textus alkymie abreviatus, compositus per magistrum Johannem de Mehum'.] 3. f123 [Book entitled 'Secretum Secretorum lapidis benedicti'. Begins: 'Omnis philosophia sive sapiencia a superna paternitate'.]