338 ESSAYS anv OBSERVATIONS 
olic acid will attraét, or be attracted more 
{trongly by, the alcaline falt than the other 
acids, which will be driven from their places ; 
and the acid of vitriol will be fo firmly united 
to the fixt falt, that no other acid or known 
body is capable to feparate them. 
Acatn, If {pirit of nitre is poured upon a 
compound faline liquor, or falt made of {pi- 
rit of fea falt and falt of tartar, and upon an- 
other made of fpirit of vinegar and the fame 
falt of tartar ; the fpirit of nitre, by its fuperi- 
or attractive power, will join itfelf to the al- 
caline falt, and drive away the other acids; 
but is not able to refift the ftill greater force 
of the vitriolic acid. 
LasT iy, If {pirit of fea falt is poured up- 
on a compound of fpirit of vinegar, or any 
other vegetable acid and a fixt alcaline falt ; 
this will be more ftrongly attracted by the 
acid of fea falt, than by the vegetable acid 
which will be expelled: but the {pirit of fea 
falt may likewife be diflodged by the acids of 
vitriol or nitre. 
In moft folutions, precipitations, and other 
operations by which the texture of bodies are 
much changed, there are fome appearances, 
fuch as an expanfion and bubbling, the pro- 
duction 
