(^57) 
but a ihort coldnefs ; or at two^ three, orfour fevera! times, if 
you defire, that the produced coldnefs lliould rather !aft forae- 
what longer than be fo great. Stirre the powder in the Liquor 
with a ftick or whalebone ( or fome other thing, that will noC 
be injured by the fretting Brine, that will be made) to haften 
the diffolutioia of the Salt i up@n the quicknefs of which de- 
pends very much the intcnfity of the Gold , that will enfue up- 
on this Experiment. For the clearing up whereof, I fhall an- 
nex the following particulars. 
I. That a confiderable degree of Cold is really produced 
by this operation, is very evident : Firfl^ to the touchy Secoudly^ 
by this, that if you make the Experiment ( as for this reafon I 
fometimes chufe to do) in a Glafs-fiody or a Tankard, you 
may obfervCjthat, whilft the Solution of the Salt is making^the 
outfide of the Metalline Veflel will, as high as the mixture 
reaches within^ bebedew'd (iflmay fo fpeak ) with a multi- 
tude of httle Drops of Water, as I have ^ eltewhere fliown that 
St happens, when mixtures of Snow and Salt,be- ^ ' 
ing put into Glafles or other Veflels,the aque- efCol/ 
ousvapors,that fwimtoand frointhe Air, and 
chance to glide along thcfidesof the Veffelsj ate by the cold- 
Befs thereof condens'd into Water* And in our Armoniack 
Solution you may obferve, that if you wipe off the Dew from 
any particular part of the outfide of the Veflel, whilft the folu. 
tioa does yet vigoroufly goe on, it will quickly collect frefli 
Dew^ which may be fometimes copious enough to run down the 
fides of the VeffeU J?ut Thirdly, the beft and fureft way of find- 
ing out the Coldnefs of our Mixture is that, which I fliew'd you 
by plunging into it a good feal'd Weatherglafs furnifli't with 
tinfted Spirit of Wine. Forjthe Ball of this being put into our 
frigoriiick mixtures the Crimfon Liquor will nimbly enough 
defcend much lower, than when it was kept either in the open 
Air, in common Water^of the fame temper with that, wherein 
the Sal Jirmmiac\ was put to diflblve. And if you remove the 
Glafs out df our Mixture into common water, the tin(51:^ Spi- 
rit will, (as you may remember, it did) haftily enough reafcend 
for a pretty while, according to the greater or lefler time, that 
it continued in the ^r^(?«?^^^:^Solution. And this has fucceeded 
with me, when inftead of removing the Mixture into Common 
Waterj I removed it into water newly impregnated with Salt* 
■peter. ' ' " Mm 2 2, The 
