[ an ] 



194 grs. barofelenite contain 67,7, 100 grs. of the baiofelenite 

 fhould contain 34,92, which differs from Klaproth's refults by 



Again, Dr. Black, in the analyfis of Geyfer Waters, p. 117, 

 tells us that 170 grs. barofelenite contain as much acid as 100 of fully 

 deficcated Glauber. Now I have already fhewn by my own experi- 

 ments that 100 grs. of deficcated Glauber contain 56,08 of real vi- 

 triolic acid, therefore 1 70 of barofelenite contain the fame quantity, 

 and if fo, 100 grs. barofelenite muft contain 32,98, very nearly 33, 

 which we fee fcarcely differs from Klaproth's proportion, the quan- 

 tity of real acid being computed from my table. 



Lastly, Klaproth found that 100 grs. of deficcated Glauber 

 decompofed by acetited barytes gave 168 grs. of barofelenite. 

 I Klapr. 333. Then 168 grs. barofelenite contain 56,08 of real vi- 

 triolic acid, and 100 fhould contain 33,38 of this acid. The con- 

 fonance of thefe refults with my table may hereby be eafily dif- 

 cerned. In general then the quantity of real acid in any quan- 

 tity of ignited barofelenite may be difcovered by dividing it by 3, 

 it being j of the whole weight. 



Hence 100 parts barytic earth take up 50 of real vitriolic acid, 

 and would give 150 of barofelenite. And 100 grs. real vitriolic 

 acid take up 200 of barytic earth, and afford 300 of barofelenite. 



D d 2 SeSlion 



