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Section ^b. 



Aerated Stronthian. 



100 parts native aerated ftronthian, or of the artificial fuffi- 

 ciently dried, contain 31 of fixed air and 69 of earth. 



Hence the quantity of air in any given quantity is found by 

 multiplying this quantity into 0,31, and the quantity of earth by 

 multiplying it into 0,69 ; then 100 parts of this earth are faturated 

 by 45 of fixed air, and 100 parts of fixed air by 222,5 of this 

 earth. 



According to Dr. Hope, 100 grs. of cryftallized ftronthian 

 lime contain 32 of earth and 68 of water. 



LowiTz found 100 grs. of the artificially aerated ftronthian to 

 contain, when dried in heat, 32,5 per cent, of fixed air. i Chy. 

 Ann. 1796. 128. 



Per Pellitier, 100 grs. native aerated ftronthian calcined with 

 10 grs. charcoal loft only 28 grs. 21 Ann, Chy. 124. 



VlTRIOLATED StRONTH'AN. 



100 Parts vitriolated ftronthian contain 42 of real vitriolic acid, 

 for this is the quantity which muriated barytes feparated from the 



tartarin 



