[ 499 ] 
Experiments I. and II. 
With common wine and diftilled vinegar*. 
The plain vinegar ufed, was faid to be the belt 
white wine vinegar that could be got; and the di- 
ftilled was faid to be prepared from wine vinegar 
likewife. 
I faturated a pint of each of thefe vinegars, with 
the pure alkali, evaporated them to a pellicle, and 
let them Hand to cryftallife. 
From the diftilled vinegarlobtained thefalt repre- 
fented by <z, a , fig. 14, Plate XXIV. which in 
the, evaporating glafs appeared as you fee it, reiem- 
bling the figure of a fun in a fire-work. . Its cry- 
ftals were a little twitted j and upon taking them 
out, and examining them feparately, they appeared 
like fo many fmall cryftals of glauber fait, as ate 
reprefented by b , b , b . — On laying the evaporating 
glafs on one fide to allow the liquoi to diain avvay, 
fome thin flat fquare cryftals, fuch as are reprefented 
by c , c , c, formed on the fides of the glafs. 
And what is very particular with regard to this 
fait is, that, on diffolving fome of the cryftals, re- 
fembling thofe of glauber fait, in pure water, and 
fully faturating the water with the fait, in fome 
days there formed a number of cryftals very diffe- 
rent in figure and appearance from the former; be- 
* The neutral fait with vinegar I find mentioned, but not de- 
ferred, in a chemical diftionary pubhfoed at Pans i m the year 
I766.-AU that is faid of it is, that it is a fait which cryftal- 
liies eafily, but is little known. 
Liiac a u **• — — j 
See the articles Alkali Mi- 
neral, 
Sel neutre, and^nsrAiGRE. 
ing 
