( S^o ) 
I add farther, that even the violent Agitation which 
this mixture caufes^ being not univerfal, and pafling no 
farther than fome few places of the Liquor ^ it may for 
all that, contribute to the great Coldnefsin the mixtare of 
Sal Armoniac and Oil of Vitriol, in encreafing tte Coagu- 
lum, fo that the little Particles which are violeacly agi- 
rared in this Mixture, being not able to draw along with 
them in their motion rhe Coagulated parts which are too 
grofs ^ they drive them away from the Center of tliei.r 
Motion : So that theCe particles almoft half coag'jlated, 
being got amongft thefe little Whirl-pools, and prefs'd 
one againft another, they ftick clofe to one another, co- 
agulate fdll more ftrongly, and lofe their motion entirely • 
which caufes a very great cold. If any man can fcarce 
perfuade him.felf that the Violent Agitation in fome parts 
of the Mixture does contribute to the Coldnels of the Li- 
quor, he may be convinced by the following Experiment. 
■Ex^rrimntof I Pi-^t fome cold Water into a great Bafin, I put into the 
^yater eociedi^y middle of the Water a Cucurbit of Glafs full of Water e- 
qnally cold. I put into the Cucurbit a very good Thermo- 
meter, v/hich I let lie a good while for a TryaL 
When it was adjufted to a Degree proportionable to the 
Cold of the Water, I threw fuddenly into the Water in 
the Bafin four or five Shovels full of Coals well kindled 5 
and in an inftant, the Liquor of the Thermometer de- 
fended 2 or 3 lines. After fome moments, the Liquor 
rcfe again, when the Heat of the Water in the Bafin was 
communicated to the Vefle] of Glafs. 
^f^jh of this The Cold of the Water of the Cucurbit, can't be at- 
^^Ptriment. tributed to any thing befides the PrefSon or fudden Con- 
denfation which the Fire caufed in the Water, wherein it 
was put. Which condenfation may be explained in this 
manner. 
In the inftant that the burning Coals were thrown into 
the Water, the Vortex of the Subtil Matter by which it 
was turned round, being prefs'd by the Water which en* 
vironed it, fcatter'd with vii^lence all the particles of the 
Wa- 
