n times past the Philosophers spake afters diuers and sundrie manners throughout their writings, sith that as it were in a riddle and cloudie voyce, they haue left vnto vs a certaine most excellent and noble science, but altogither obscure, and without all hope vtterly denied, and that not without good cause. Wherefore I would aduise thee, that aboue all other bookes, thou shouldest firmly fixe thy mind vpon these seuen Chapters, conteining in them the transmutation of mettalls, and often call to minde the beginning, middle, and end of the same, wherein thou shalt finde such subtilitie, that thy minde shalbe fully contented therewith.