[ 49i ] 
The letters a. a. &c. reprefent pieces of this cry- 
ftallifation viewed from above ; b. b. &c. fome of the 
fine plates laid on their fide ; c. c. and e fome of the 
afh coloured plates obtained in the firft operation ; 
d. d. fome of the brown clay coloured faline matter; 
f* the flattifh globules, which befet every where the 
infide of the pellicle, that was on the top. 
After the cryftallifation of the fait in this fecond 
procefs, the liquor which remained was poured into 
another fmall china bafon ; and, on being evaporated, 
exhibited nearly the fame appearances as had been 
obferved in the firft procefs. 
Experiment VIII. 
With the acid of wild forrel. 
In order to fave the trouble of a tedious evapo- 
ration, by faturating this acid mixed with the other 
juices of the plant, I procured fome of the effentiai 
fait of the wild forrel, from Mr. Heineken, apothe- 
cary in Duke-ftreet ; which I difiolved in boiling 
water, and faturated with the alkali ; and by evapo- 
rating obtained a beautiful pure white neutral fait, 
which is reprefented by fig. 8 ; a. a. fhews a part of 
the cryftallifation where the fait (hot into longifh 
cryftals, refembling fomewhat the fmall ones of 
nirre; none of them exceeded the length of half an 
inch ; b. b. other pieces of the cryftallifation, which 
had a different appearance ; c. c. a piece where it ap- 
peared like a fmall granulated fait ; d. d. fome fmall 
roundifh or fquare cryftals, which adhered like 
R r r 2 a cruft 
