The Secret Book:
(51) Hear now this secret: keep the body in our mercurial water, till it ascends with the white soul, and the earthy part descends to the bottom, which is called the residing earth. Then you shall see the water coagulate itself with the body, and be assured the art is true; because the body coagulates the moisture into dryness, like as the rennet of a lamb or calf turns milk into cheese. In the same manner the spirit penetrates the body, and is perfectly comixed with it in its smallest atoms, and the body draws to itself his moisture, to wit, its white soul, like as the loadstone draws iron, because of the nearness and likeness of its nature; and then one contains the other. And this is the sublimation and coagulation, which retaineth every volatile thing, making it fixed for ever.
(52) This compositum then is not a mechanical thing, or a work of the hands,, but as I said, a changing of natures; and a wonderful connection of their cold with hot, and the moist with the dry; the hot is mixed with the cold, and the dry with the moist: By this means is made the mixture and conjunction of body and spirit, which is called a conversion of contrary spirits and natures, because by such a dissolution and sublimation, the spirit is converted into a body and body in a spirit. So that the natures being mixed together, and reduced into one, do change one another: and as the body corporifies the spirit, or changes it into a body, so also does the spirit convert the body into a tinging and white spirit.
(53) Wherefore as the last time I say, decoct the body in our white water, viz. mercury, till it is dissolved into blackness, and then by continual decoction, let it be deprived of the same blackness, and the body so dissolved, will at length ascend or rise with a white soul. And then the one will be mixed with the other, and so embrace one another that it shall not be possible any more to separate them, but the spirit, with a real agreement, will be unified with the body, and make one permanent or fixed substance. And this is the solution of the body, and coagulation of the spirit which have one and the same operation. Who therefore knows how to conjoin the principles, or direct the work, to impregnate, to mortify, to putrefy, to generate, to quicken the species, to make white, to cleanse the culture from its blackness and darkness, till he is purged by the fire and tinged, and purified from all his spots, shall be the possessor of a treasure so great that even kings themselves shall venerate him.
(54) Wherefore, let our body remain in the water till it is dissolved into a subtle powder in the bottom of the vessel and the water, which is called the black ashes; this is the corruption of the body which is called by the philosophers or wise men, Saturnus plumbum philosophorum, and pulvis discontinuatus, viz. Saturn, latten or brass, the lead of the philosophers the disguised powder. And in this putrefaction and resolution of the body, three signs appear, viz., a black color, a discontinuity of parts, and a stinking smell, not much unlike to the smell of a vault where dead bodies are buried. These ashes then are those of which the philosophers have spoken so much which remained in the lower part of the vessel, which we ought not to undervalue or despise; in them is the royal diadem, and the black and unclean argent vive, which ought to be cleansed from its blackness, by a continual digestion in our water, till it be elevated above in a white color, which is called the gander, and the bird of Hermes. He therefore that maketh the red earth black, and then renders it white, has obtained the magistery. So also he who kills the living, and revives the dead. Therefore make the black white, and the white black, and you perfect the work.
(55) And when you see the true whiteness appear, which shineth like a bright sword, or polished silver, know that in that whiteness there is redness hidden. But then beware that you take not that whiteness out of the vessel, but only digest it to the end, that with heat and dryness, it may assume a citron color, and a most beautiful redness. Which when you see, render praises and thanksgiving to the most great and good God, who gives wisdom and riches to whomsoever He pleases, and takes them away according to the wickedness of a person. To Him, I say, the most wise and almighty God, be the glory for ages and ages. Amen.