I could have forborn to set down the preparation of the fulminating gold, and so save paper and time, in regard that it is described by others: but because I promised in the first part to teach how to make the flores of gold, and that those are to be made out of fulminating (or thundring) gold, I thought it not amiss to describe its preparation, that the lover of this Art need not first have his recourse to another book for to find out the preparation, but by this my book may be furnished with a perfect instruction for the making of the flores of gold, and this is the common way for to make _Aurum fulminans_, known unto most Chymists; but in regard that easily an error may be committed in it, either by pouring on too much of the liquor of Tartar (especially when it is not pure enough, so that not all the gold doth precipitate, but part of it remaineth in the solution, whereby you would have loss; or else, the gold falling or precipitating into a heavy calx, which doth not fulminate well, and is unfit for to be sublimed into flores. Therefore I will here set down another and much better way, whereby the gold may be precipitated quite and clean out of the _Aqua Regia_ without the least loss, and so that it cometh to be very light and yellow, and doth fulminate twice as strong as the former, and there is no other difference between this and the former preparation, but only that instead of the oyl of Tartar, you take the spirit of urine, or of salt armoniack for to precipitate the dissolved gold thereby; and the gold (as before said) will be precipitated much purer, than it is done by the liquor of the salt of Tartar, and being precipitated, it is to be edulcorated and dryed, as above in the first preparation hath been taught. _The use of Aurum fulminans._ There is little to write of the use of _Aurum fulminans_ in physick; for because it is not unlockt, but is only a gross calx and not acceptable to the nature of man, it can do no miracle. And although it be used to be given _per se_ from 6, 8, 12. grains to ℈ i. for to provoke sweating in the Plague, and other malignant feavers, yet it would never succeed so well as was expected. Some have mixed it with the like weight of common sulphur, and made it red hot (or calcined it) whereby they deprived it of its fulminating vertue, supposing thus to get a better medicine, but all in vain, for the gold calx would not be amended by such a gross preparation. But how to prepare a good medicine out of _Aurum fulminans_, so that it may be evidently seen, that the gold is no dead body, nor unfit for physick, but that it may be made quick and fit for to put forth or shew forth those vertues which it pleased God to treasure up in it, I shall here briefly discover. * * * * *