[ 21 3 
The water, being again fet to evaporate, was re- 
duced to lefs than an ounce, when it was again fil- 
tred, and gr. ii fs. of a refiduum feparated. This 
fediment appeared to be nearly of the fame nature as 
the former ; but, on putting it into the mouth, I 
thought 1 could perceive fomewhat, though very little, 
of a faltifh tafte, and when thrown into water, it 
remained all undiffolved. 
The fmall quantity of water which was left, was 
next evaporated to drynefs, and there remained in 
the tea-cup gr. xvii. of a yellowifh matter, compofed 
of the thin lamellae of fome fait, and a yellow unc- 
tuous or oily fubftance. It had rofe into blifters, and 
emitted a very ftrong fmell of fulphur,. while it yet 
remained hot. 
Some of the faline matter, being put into a folu- 
tion of the cauftic alkali in diddled water, occafioned 
a white cloud ; and the fame thing happened when 
fome of it was mixed with folutions of fiiver in the 
nitrous acid, and of corrofive fublimate in diftilled 
water- 
In order to feparate the fait from the yellow oily 
matter, the fediment was thrown into and difi’olved 
in an ounce of diddled water, and then palled 
through filtring paper, and evaporated to a pellicle 
after which, it was fet in a cool place for forty-eight 
hours, in which time a crydallifation took place, 
and I feparated very near gr. xii. of a fait fimilar, in 
every refpeft, to that of Glauber ; but it had dill a 
little of the yellow oily matter adhering to it. This 
fait had a cool bitter tade j it didolved eafily in dif- 
tilled water, and when fome of the native foffil al- 
kali was added to this folution, it remained clear ; 
though. 
