C 630 ) 
duc'd, and much left, than rhar 
which appear'd in the impreg- 
nated Water * 
IX. Thirdly , The Ufeful- 
nefs of this Experiment is not 
to be eflimated only by the Ex- 
amen it helps us to make of 
dulcify 5 d Sea water, but much 
more by the Eftimate, that by 
its means may be made of na- 
tural Frefti Waters, whether of 
the form of that white Powder, that Chy mitts °PnngS, KlVers, Uouds, Lakes, 
foot over-defcrvedly) call Wrcurhs Vila. To Wells, &C. For it being aenp- 
which I way add, that I have alfo produced a n i 
Powder of t!i2t colour, by pouring into com- 
mon Water a ttrong Solution of Tin Glafs 
made in Aqua Fortit. And by the fame way 
we have precipitated the TincWe for Soluti- 
ons of the finer Partsjof Jalap, Benjamin, true 
Labdanum, Antimonial Sulphur, and diners o- 
* VIII. And perhaps it may be proper, that 
I here obferve (what is rat wont to be taken 
notice of) That divers Solurions of Mineral 
Bodies may be Precipitated by Dilution ; that 
il, (to explain this ExpreiTion) whet? the So- 
lution has time enough allow'd to difTufe it fdf, 
through a gre at quantity of Water, the Salice 
Parts are thereby fo di'uted and weakned, that 
they are no longer able to futtain the Mineral 
Corpufclcs, they kept fwimming before, but 
make with them, and the Water, a confus'd 
and fubfiding Mixture, ufua'ly of a whirifh 
colour. This may appear when the Butter of 
Antimony, being put into common Water, is 
thereby quickly 2nd plentifully precipitated in 
the 
ther Bodies mide in Vinous Spirits. If it were 
not for this Power, that Water has to weaken 
moil Solutions of Bodies, I could have em- 
ployed inttead of that Silver, either Quick- 
fiiver d]0bfV'd in Aqua fortis, or Lead crude or 
ca'cin'd, in the fame Liquor, or (which is more 
convenient) in flrong Spirit of Vinegar*, fince 
thefe, and fome others, are found xo be prect- 
rally granted, that thofe Wa- 
ters j cateris paribus, are 
beft, as well for the Wholfom 
ntfs, as divers Oeconomical 
Ufes, as Wafhing, Brewing, 
&c. that are freeft from Sait- 
nefs, which is an adventitious, 
and in moft cafes, a hurtful 
Quality in Waters; by our 
way of examining thefe Lr- 
piubleby Salt Water into whitifh Powders. But quors, a heedful Eye mzy in a 
tbo'i very heedful Obferver may for a fflifr, - ■ 
make ufe of thefe Metalline Solutions, .to guefs 
at the Quality of Water, as to Frefinefs and 
Saltnefs j yet the Precipitation thar is made by 
Vilution^ is not dffkult to be difiinguifrfdjfroTn 
that which is performed by a true and proper 
Precipitant, (ss in our cafe by the common 
Salt, that ii harboui'd in the Pores of the Wa- 
ter) both by thefl«if£Kf(?of the EfTcc% and the 
eopicufntfs of the white Subftance produced, and 
on both thofc accounts is very much in r eriour 
ro it j as may evidently appear in the very dif- 
ferent Effects that our So.'ution of — 
had upon the Patentees Water, or upon 
well diftiil'd common Water, compar'd with 
rhofe it had upon Water impregnated with a 
thoufandth part of Salt, and upon divers common urdiAilled Waters. This Advertlfrmen* 
I have plac*d ia the Margent, as not thinking it fit either to emit ir, or by inferring it in the 
Body of the Writing, to give too great an Interruption to the Series of my Difcourfe. 
plea- 
trice difcover, whether there 
be any latent Sahnds in them, 
(as moft Waters imbibe from 
the Soyl they have travel, 
or do ftagnatein) and may en- 
able one, efpecial'ly by the help 
of a little Pradlice, to give a 
near guefs, how much one Wa- 
ter is frefher than another, as 
I have purpofely try'd wltl 
