Philosophia maturata [electronic resource] : an exact piece of philosophy containing the practick and operative part thereof in gaining the philosophers stone : with the wayes how to make the mineral stone and the calcinations of mettals : whereunto is added a work compiled by St. Dunstan concerning the philosophers stone : and the experiments of Rumelius and preparations of Angelo Sala, all most famous chymists in their time / published by Lancelot Colson.