s8o ESSAYS AND OBSERVATIONS 



poured upon each of thefe fallne mixtures 

 or compound falts, the vitriolic acid will 

 attradl, or he attracted more flrongly by 

 the alcahne fait than the other acids, 

 which will be driven from their places j 

 and the acid of vitriol will be fo firmly 

 united to the fixed fait, that no other a- 

 cid or known body is capable to ieparate 

 them. 



A G A I N, If fpirit of nitre is poured up- 

 on a compound faline liquor, or fait made 

 of fpirit of fea fait and fait of tartar, 

 and upon another made of fpirit of vine- 

 gar and the fame fait of tartar ; the fpirit 

 of nitre, by its fuperior or attradive 

 power, will join itfelf to the alcaline fait, 

 and drive away the other acids, but is 

 not able to refift the flill greater force of 

 the vitriolic acid. 



Lastly, If fpirit of fea fait is poured 

 upon a compound of fpirit of vinegar, or 

 any other vegetable acid and a fixed al- 

 caline fait ; this will be more ftrongly at- 

 traded by the acid of fea fait, than by 

 the vegetable acid which will be expelled : 



But 



