[ 2IO ] 



So alfo Klaproth tells us, that a barofelenitc which he had formed 

 by dropping vitriolic acid into a muriated folution of aerated ba- 

 rytes contained barytic earth and acid nearly in the proportion of 

 2 to I, confequently loo parts of it contained 66,66 of earth and 

 33,33 of real vitriolic acid. 2 Klapr. 72.* And p. 97 he tells us, 

 he found the fame proportion in another experiment, as 126 barofe- 

 lenitc contained 42 of real acid. 



On the other hand, Fourcroy having difTolved 100 grs. native 

 aerated barytes with the afTiftance of heat in very dilute vitriolic 

 acid, found it to afford 138 grs. of barofelenitc, (inftead of 117 

 which Dr. Withering had found by the ift method) and that the 

 barytic earth had taken up 48 parts vitriolic acid. Now if 138 

 parts brofelenite contain 48 of acid, 100 muft contain 34,78. 

 4 Ann. Chym. 65. 



Klaproth found that 85,5 grs. vitriolic acid whofe fp. grav. 

 was 1,850, entered into the compofition of 194 grs. barofelenitc, 

 and by his own rule - of thefe 194 grs. were real acid = 64 66 ; 

 therefore 100 grs. of barofelenite ihould contain 33,33 grs. real 

 acid. I Klapr. 153. By my table, as already faid, 100 grs. vi- 

 triolic acid, whofe fp. grav. is 1,850, contains 79,14 grs. real acid, 

 therefore 85,5 grs. of this acid fliould contain 67,7 real acid, and if 



194 



• The barofelenite in all tliefe cafes was ignited, and he found that 185 grs. merely 

 dried weighed after ignition 180, confequently 100 parts of the merely dry lofe about 

 2,7 or 2,8 by ignition. 



