C 44 ] 



and as fome of them are very generally diftri-but- 

 ed through the earth, we find, unfortunately for 

 our inveftigation of this fubje6t, that mineral 

 water generally contains feveral of them, fome- 

 times many, which makes it neceffary to fubjecl: 

 portions of the fame water to a variety of expe- 

 riments. 



Gypfum, calcarious muriate, chalk, Epfom falt s 

 muriate of magnefia, and common magnefia, 

 aerated iron, fea-falt, and fixed air are among 

 the moft common fubftances foiind in mineral 

 waters. 



