but a fhort coldnefs ; or at two, three, or four feveral times, if 
you defire, that the produced coldnefs fliould rather laft fbme- 
whatlonger than be fo great; Stirre the powder in the Liquor 
with a ftick or whalebone ( or fome other thing, that will not 
be injur’d by the fretting Brine, that will be made ) to haften 
the diffolution of the Salt i up@n the quicknefs of which de- 
pends very much the intenfity of the Cold , that will enfue up- 
on this Experiment. For the clearing up whereof, I fhall an- 
nex the following particulars. 
i, That a coafiderable degree of Cold is really produced 
by this operation, is very evident : Fir ft ^ to the touch; Secondly , 
by this, that if you make the Experiment ( as for this reafon I 
fometimes chafe to do) in a Glafs-Body or a Tankard, you 
may obferve,that, whilft theSolution of the Salt is making,the 
outfide of the Metalline Veflel will, as high as the mixture 
reaches within, be bedew'd (if I may fo fpeak ) with a multi- 
tude of little Drops of Water, as I have* elfe where fhown that 
it happens, when mixtures of Snow and Salt, be- % 
ingput intoGlafles or other Veflels,the aque- cfCol/. 
ous vapors, that fwim to and fro in the Air, and 
chance to glide along thefidesofthe Veffels, are by the cold- 
nefs 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 Vefifel, whilft the folu- 
tion does yet vigoroufly goe on, it will quickly colled: freili 
Dew, which may be fometimes copious enough to run down the 
fides of the Veffel* But Thirdly , the beft and fureft way of find- 
ing out the Coldnefs of our Mixture is that, which I fhew’d you 
by plunging into it a good feal’d Weatherglafs furnifli’t with 
tiufted Spirit of Wine. For, the Ball of this being put into our 
frigorifick mixture, 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 Armoniack, was put to diffolve. And if you remove the 
Gl.ifs out of our Mixture into common water, the tinded Spi- 
rit will, (as you may remember, it did) haftily enough reafcend 
for a pretty while, according to the greater or defter time, that 
it continued in the Armoniack^ Solution. And this has fucceeded 
with me, when inftead of removing the Mixture into Common 
Water, I removed it into water newly impregnated with Salt- 
ter, Mm2 2. The 
