Would fain introduce fome new thing, eVen againft ex- 
,periencei& who would yet farther confound,the confufed 
World,through their opiniated PhilofophicalArguments, 
whereas they had more need be lead out of miftakes. I 
fhall begin with Aurum Fulminans ; to prepare this, is fo 
well known, that I need not defcribe the way. The 
Gold cannot be diffolved without ^ fri^idum, but when 
it is oncediffolved by it, it muft be precipitated by the 
fame again, e. g. with fpirit of Urine i by this means, 
you get a powder , that gives a great report, a very 
clear light, and burns. If you cannot fee the Light- 
ningjfor it is very tranfient, you may put out the Candle^ 
and you v^iil eafily difcern it. Here is nothing but an 
Jcidum 2ii\dvrinofum joined by an Earth i from whence 
this Thundring noife proceeds, of which in fome Manu- 
fcripts, that I have yet by me,l have more copioufly treat- 
ed. Perhaps it may be faid, that it I precipitated the 
matter, with fait of Tartar,it would be one and the fame 
thing: why dos this make it heat as well, as if it were ^xq- 
cipitatcd With 2inVrmofum or frigidum. I anfvverinfew 
words: that there is already in the folution, as much of 
the Vrinofum as is neceffary, fo that a farther affufion of 
an Vrinofum, will not well agree. Therefore it happens, 
that when the Gold is precipitated by this Alkali, fo 
calld; the vrinofum may be fo fuppreffed, as not to make 
anexplofion (the reafon of which isalfo well known to 
me,) now in cafe the precipitate fliould be dryed, and im- 
bibed fometimes with a fpirit of urine, it will then reco- 
ver its fulminating power again. So that we fee, where 
heat and flame is, there muft be two contrary Principles. 
In the next place. If 1 take a good fpirit of Nitre, and 
drop upon \tguttatim, fpirit of Wine, until itceafes to 
make an ebullition, the Vrinojum is then in a ballance 
with the Acidum, Only put this fait in a heated crucible, 
and it will go off with an cxplofion ; only you have here 
no report, but heat and light: but if you joynitwithan 
Ed^nh (as Aurum Fulminans is,) you fliall then have are- 
, ^ M 2 pert. 
