ie & a 
one night's reft part of the fugar of lead cryftallized in the bottom 
of the veflel, by which it is plain that too much of it had been 
ufed. Thefe cryftals weighed 240 grains ; the fupernatent liquor 
I again evaporated to nearly 2, and after two days obtained large 
pellicles of acetous foda, which I feparated; they weighed 325 
grains; to the refiduum, which ftill had a fweetifh tafte, I added 
a folution of mineral alkali, until no further precipitation ap- 
peared; a very fmall quantity of the alkali was fufficient for 
this purpofe. I then evaporated the remainder nearly to drynefs ; 
and afterwards heated it in a crucible to rednefs: In this heat 
it inflamed, and when calcined nearly to whitenefs, I took it out 
and diffolved it in twelve ounces of water, filtered it, and on 
adding an hot folution of allum obtained a precipitate, which 
when dried weighed 169 grains, and indicated the quantity of 
pure alkali to be 112 grains nearly. In this procefs nothing is 
loft, for the lead may be either revived or turned into a pig- 
ment, 
Laftly, Glauber’s falt may afford the mineral alkali, but moft 
eafily in the form of liver of fulphur: I endeavoured to decom- 
pofe it by the above procefs, but the quantity of alkali obtained 
from a large quantity of it was very inconfiderable, 
Or THE VEGETABLE ALKALI, 
Ir is univerfally known that this alkali may be extraéted in 
greater or leffer quantity, by lixiviation, from the afhes of 
almoft all vegetables, and it is now well eftablifhed that it pre- 
F exifts 
