PHYSICAL AND LITERARY. 3^9 



yet are not fo changed by this union, but, 

 when they are again artfully disjoined, 

 they may exert the fame powers and pro- 

 duce the fame efFe£ls as before their uni- 

 on : Therefore we may conclude, that the 

 figure, bulk, and denfity of the acid par- 

 ticles are not changed, though the liquors 

 may differ fomewhat in flrength from 

 the greater or fmaller proportion of 

 phlegm, or water accompanying the real 

 ^cid. 



VIII. One acid which has been united 

 to an alcaline fait may be fet at liberty, 

 or expelled from its cohefion with the al- 

 caline fait, by another acid of a different 

 origin. But this does not happen indif- 

 criminately ; for the oil of vitriol expels 

 any other acid, but cannot be dillodged 

 by any of the reft. A volatile alcaline 

 fait is expelled from its union with an 

 acid, by a fixed alcaline, but not contrary- 

 ways. 



Vol. I. A a a - Gmsrai 



