- pHYSICAL anp LITERARY. 215 
reduced to a very fine powder, and thrown 
into a filtrated mixture of an ounce of a 
fixed alkaline falt and two ounces of wa- 
ter. After a flight digeftion, the powder 
being well wafhed and dried, weighed 
one dram and fifty eight grains. It was 
fimilar in every trial to a fine powder of 
ordinary chalk, and was therefore fatu- 
rated with air which muft have been fur- 
nifhed by the alkali. | 
A dram of pure falt of tartar was dif | 
folved in fourteen pounds of lime-water, 
and the powder thereby precipitated, be- 
ing carefully collected and dried, weigh- 
ed one and fifty grains. When expofed 
to a violent fire, it was converted into a 
true quick-lime, and had every other qua- 
lity of a calcarious earth. 
THIs experiment was repeated with 
the volatile alkali, and alfo with the foffil 
or alkali of fea-falt, and exactly with the 
fame event. 
Tue third propofition had lefs appear: 
ib ance of probability than the foregoing ; 
_ but, as an accurate experiment was the on- 
“Ay teft of its truth, I reduced eight grains 
: of 
