Jarcus saith: Thou hast left obscure a part of thy discourse, O Bacsen! And he: Do thou, therefore, Jargus, in thy clemency shew forth the same! And he answereth: The copper of which thou hast before spoken is not copper, nor is it the tin of the vulgar; it is our true work (or body) which must be combined with the body of Magnesia, that it may be cooked and pounded without wearying until the stone is made. Afterwards, that stone must be pounded in its vessel with the water of nitre, and, subsequently, placed in liquefaction until it is destroyed. But, all ye investigators of this art, it is necessary to have a water by which the more you cook, so much the more you sprinkle,* until the said copper shall put on rust, which is the foundation of our work. Cook, therefore,and pound with Egyptian vinegar.