io fBe^a^ if iiibf¥ inV (^\d mioxix 'S^lts up 'to the 
6ther ftl^ pyrtkJei^^Whfcli ca^Ts'd a very agreeable Phcenome- 
non 5 but when the weather grew damp and moid, all tlie 
Cryftal Salts were melted, and the Gold colour Salts were 
niixt with the common Particles. 
I took another litcte piece of Gold that had been workt 
by aGoldfmi^h,' and' having beaten it very thin, I put it 
into the fame Glafs where my other Gold had been, with 
Jqna Regia^ and obferv*d that a white Subftance was fepa- 
rated from it arid fubfided in the bottom ot the Glafs ^ for 
we know that as J^;/^ Fortis diflblves Silver, whilft the 
Gold efcapes untoucht,* fo AquaRegia diflolves Gold, with- 
out afFefting the Silver at all. 
Hence I infer, that ' that Gold was alloyed with fome 
Silver, which was the \V hire Subftance, feparated, as I 
faid before, whereas according to our Laws the Wrought- 
Gold (hould confid ot 22 Car its. 
The Piece of Gold that lay in tht Aqm Regia would not 
be united with it ^ whence;! concluded that there was too 
much Gold and too little Water, for I had made the Glafs 
fo hot that I could not bear it wi^h my hand. 
Moreover, I took a fmall piece of Copper and put it in- 
to ^4^;^^ 2?eg/^, where a little Gold had been already dif- 
folved, and pfefently obfervect that the J^r/^^i Ke^z/t began 
to operate upon the Copper, as if it had lain in Aqiia For* 
tk 5 the Gold alfo cemented with the Copper, but in much 
fm^ljer Branches than Silver in Jqna Forik ^ and I faw that 
the Gold coagulated - fo ftrongly with the Coj^pef, that 
the Water about the'pJd;X3opper was qui diverted of its 
Gold colour :5 and lifted' aa hdtirs- iitnb ' the ^Wa?fr W^s^ fb 
impregnated withf the f*article^: of We'- GO^er that itaf- 
fumed a Green colour, and then oWe mJght perceive with, 
the naked Eye the Gold that lay about the Copper. ;/ 
Agaifl, -I took other AijUaJR^i^- that %as- ittipregna^ed 
With fb^ much Gt^lS! thaj^ it WuId'diflbilTO^ 
obf^yed that the^fcS^ated SSft"i)grtl^ 
' - - ■ ' tradrdinary 
