But there is yet another vinegar, of which there is often mention made in the books of Philosophers, by the help whereof, many wonderful things are performed in the solution of metals, the name whereof the ancients have been silent in; of which I do not here treat, because it cannot be made by this furnace; but I shall treat of it in another part; yet so that I incur not the Curse of the Philosophers. _How spirits may be made out of the salt of tartar, vitriolated tartar, the spirit of salt tartarizated, and of other such like fixed salts._ As many Chymists as there hath been, almost all have been of the opinion that a spirit cannot be drawn out of salt of tartar, and other fixed salts. For experience hath taught that by retort little or no spirit can be drawn from thence, as I had often experience of before the invention of this furnace: the reason of which thing was the admixtion of sand, earth, bole, pouder of tiles, _&c._ for to prevent the flowing of the salt of tartar, being by this means dispersed. But this is done through the ignorance of Authors, who have been ignorant of the properties of salt of tartar. For a stony matter, as sand, flint, bole, _&c._ being mixed with salt of tartar, feeling the heat of the fire, and being made red with the same, is joyned to it most closely, so as no spirit can be drawn from thence, but become a most hard stone. For sand, and such things that are like to it, have so great an affinity with the salt of tartar, that being once united can scarce ever be separated. Yet it may be made by Art by the addition of pure sand, or flint, because the whole substance of the salt of tartar may be turned into a spirit in the space of one or two hours, as shall be taught in the second part, and it excells all other medicaments in vertue, in curing the stone, and gout. And if by the regiment of art there be left any _Caput Mortuum_ in the distillation, it hath, being dissolved in the air, a power to putrify metals being prepared, and mixed with it, in the space of few hours, so as to make them become black, and to grow up like trees with their roots, trunks, and boughs, which by how much the longer they are so left, become the better. Of calx of lead being subtilized, and of salt of tartar may be made a _spiritus gradatorius_ of wonderful vertues as well in Medicine as Alchymy. There is made of the _Caput Mortuum_, _per deliquium_ a green liquor which doth wonderful things; whence it is proved, _That Saturn is not the lowest of the Planets_; enough to the wise. _And so is the Lac Virginis, and the Philosophical Sanguis Draconis made._