to communicate them to his Friends, and to allo w them t© dif- 
pofe thereof, upon a hope.! that equitable Readers will be ready 
to excufe,if hereafter they ffiould appear alfo in the Treatifes 
they belong to, iince he confents to this Anticipation, but to 
comply with thofejthat think the imparting of real and practi- 
cal Experiments, may do the Publick fome Service, by excite- 
ing and affifting mens Curiofity in the interim, 
' As for the Experiment, you faw the other day at my Lodg- 
ings, though it belongs ( to fome Papers about Cold, that (you 
know) could not be PubliihY, when the reft of the bJifiory came 
forth, and therefore was referved for the next Edition of that 
Book • yet the Weather having Been of late very hot, and 
threatning to continue fo, I prefume, that to give you herein 
compliance with your Curiofity an Account of the Main and 
Practical part of the Experiment, may enable you to gratify 
not onely the Curious among your Friends, but thofe of the 
Delicate, that are content to purchafe a Coolnefs of Drinks 
at a fomewhat chargeable rate, 
Youmay remember, , that the Spring before the Iaft, I ffiew’d 
you a particular Account of a wayy wherein by a certain fuE- 
ftancetabtain’d from Sal Armomack^ I cpuld prefently, produce 
a confiderable degree of Cold, and that with odd Circumftances 3 
without the help of Snow, Ice , Niter &c» But that Experiment 
being difficult and eoftly enough, and defign’d to afford men 
Information, not Accommodations, I afterwards tryed, what 
fome more cheap and facile mixtures of likely Bodies with Sal 
Armoniac\yvQXi\&&o towards the Production of Cold, and af- 
terwards I began to confider, whether to that purpofe alone 
(for my firft experiment was defign’d to exhibite other fhmo- 
mem too ) thofe mixtures might not without inconvenience be 
omitted: and I was much confirm’d in my conjecture, by an 
accident , which was cafually related to me by a very Ingenious 
Fhylician of my acquaintance, but not to be repeated to you 
In few words, though he complain’d, he knew not what to make 
©fit. 
Among the feveral ways, by which I have made infrigidating 
Mixtures with SalArmomac\, the moft fimple and facile is this: 
Take one pound of powder’d Sal Armenia and about three 
Pints (or pounds ) of Water, put the Salt into the Liquor, ti- 
tbit: altogether, if your defign be to produce an intenfe, though 
