2. The VpirattOK of the Cold, produc d by this Experiment, depends upon 
feveral Circumftances -^as Tirfl-yM^on the Seafon of the year, and prefent tem- 
perature of the Air For,in Summer and Hot weather the Cold will fooner 
decay and expire. Secondly ^^^on the Quantity of the Sale and W^ter : For, 
if both thefe be great, the effeA will be as well more lading, as more confide- 
rab]f.T^ir^/7,for ought Tyet ktiow,we may here add the Goodncfs & Fitneft 
of the particular parcel of Salt, chat is imploy'd : for, though it be hard to dif- 
cefn beforehand,which will be the more, and which the lefs proper yet forae 
iFials have tempted me to fuFpeA, that there may bea confiderable difj^arity, 
as ro their fit nefs to produce Cold, betwixt parcels of Salt, that are without 
fcruple look't upon as Sal A.rraomack:Of which difference it were not perhaps 
very difficult to aflign probable reafons from the Narureof the Ingredients 
of this compound Concrete,and the waics of preparing it. But the Durationof 
the Cold may be conceived to depend alfo, Fourthly.u^on the Way of putting 
in the. Salt into the Water For , if you caft it in all at once,the Water wil foon- ' 
er acquire an intenfe degree of Coldnefs- biit it will alfo the fooner return to 
its former temper Whereas , if yoa defife but an inferiour degree of that 
Quality^but that may laft longer(which wil ufually be the moft convenient for 
the Cooling of Drinks,) then you may put in the Salt by little and little. Jor, 
keeping a long Wearher-glafs for a good while in our impregnated Mixture,l 
often purpofely try*d,that3\^hen the tinded liquor fubfided but flowly^or was 
u a ftand^by putting in, from time totime,2. or 3:. fpoonfuls of frefh Salt,and 
{lirring the Water to quicken the Diffolution,the Spirit of Wine would begin 
again to defcendjif it wcr€ at a ftand or rifing , or fubOde much more fwiftly 
than it did before. And if you would lengthen the EKperiment, it may not be 
amifs,that part of the Sal Armoniack be but grofly beaten, that it may be the 
^ longer in difroIving,and confequently in Cooling the Water. Whilft there arc 
dewy drops produced on the outfideof the Veffel , *tisa fign , that the Cold 
within continues pretty ftrong . for.when it ceafes, thefe drops efpecially in 
warm weather,;wiiLby degrees vanifti.But afurer way of meafuring the dura*- 
tion of the Cpld,is, by removing from time to time the Seal'd Weather- glafe 
out of the Saline Mixture into the fame common Water ,with part of which it 
was made. And thoughit be not eafie to detcrmin any thing particularly about 
Ais matter jctit fiiay fomewhat aiSft you in your Eftimaces, to be informM^ 
That 5 havein the Spring by a good Weather. gla (is found a fenfible adventi- 
tious Cold jmade by a pound of Sal Armoniack at the utmoft,to laft about 2. 
or3,hourSi 
3 . Tocool Drinks with this Mixture,you may put thcra in GIafle$,the 
thinner the better ; which ( their orifices being ftopp'd , and ftill kept above 
the Mixture) may be mov*d to and fro in it , and then be immediately poarMi 
out to be dr.unk:Though,when the Glafs,! imployed,was conveniently fliap'd^. 
asjike a Strgar.Ioaf,or with along Neck, I founditnot araife todrink it out 
of thac^without pouring it into any other • which can fearce be done without 
IclTr i ng the <':oolnefs. The refrigeration, if the Glafs- viall be convenient,is * 
quickly ptrform'd j And if one have a mind to cool his hands, he may readily 
do n by applying them to the outfide of theyeflel, that containsi the rcfri^- 
mtingjMixture- By^whofe Iielp,pieces of CKryftal^pr Bullets for the cooling o 
