8vo, [viii], 157, [6] pages; title vignette and text engravings (among which The Twelve Keys of Basil Valentine). First part only, in 1712 "Letztes Testament" was published, not present here. Age-toned, due to the paper quality. Sewn
Text in German, contains "The Stone of the Ancient wise men", 12 keys, Repetition, Treatise concerning the Microcosme, Supernatural medicine, the Planets. "Each chapter, or "key", is an allegorical description of one step in the process by which the philosopher's stone may be created' (Wikipedia) Ref. Esoterica 5030 ; Ferguson Bibl. chemica I, 80-81 "Since the writings contain apparently first notices of a good many chemical reactions and products, it would be satisfactory to have the date of these settled once for all and assigned to the proper authority