British Library MS. Add. 15549. Paper and vellum. Small quarto. 15th Century. A collection of alchymical treatises, transcribed in the year 1474 by D.R. [much more information in catalogue] The initials D.R., with the date 1474, are affixed to several of the articles, and are probably intended to design David Ragnor, of Wales, who is named at f94 as the author of two processes there added. It is not impossible that he was the compiler of the Thesaurus Mundi, the principal treatise of the collection.