Collectanea Chemica, ed. by A.E. Waite, , at sacred-texts.com
Of the Transmutation.
IT is much to be lamented that the seekers of natural knowledge in this art propose, principally, the Science of Transmutation as their ultimate view, and overlooking the chief excellency of our Stone as a medicine. Notwithstanding this grovelling spirit, we shall commit the issue to His Providence, and declare the
[paragraph continues] Transmutation (which, indeed, the philosophers do) openly, after which we shall describe the further circulation of our Stone for an increase of its virtues, and then make an end of our treatise.
When the artist would transmute any metalfor instance, leadlet a quantity be melted in a clean crucible, to which let a few grains of gold in filings be cast; and when the whole is melted, let him have in readiness a little of the powder, which will easily scrape off from his "stone," the quantity inconsiderable, and cast it on the metal while in fusion. Immediately there will arise a thick fume, which carries off with it the impurities contained in the lead, with a crackling noise, and leaves the substance of the lead transmuted into most pure gold, without any kind of sophistication; the small quantity of gold added, previous to projection, serves only as a medium to facilitate the transmutation, and the quantity of your tincture is best ascertained by experience, as its virtue is proportioned to the number
of circulations you have given after the first has been completed.
For instance: when you have finished the stone, dissolve it in our mercury again, wherein you have previously dissolved a few grains of pure gold. This operation is done without trouble, both substances readily liquefying. Put it into your vessel, as before, and go through the process. There is no danger in the management, but breaking your vessel; and every time it is thus treated its virtues are increased, in a ratio of ten to one hundred, a thousand, ten thousand, etc., both in medicinal and transmuting qualities; so that a small quantity may suffice for the purposes of an artist during the remaining term of his life.