90 



MR. F. C. CALVERT ON THE SOLUBILITY OF 



mendation given by some chemists is followed, viz., to add a 

 great excess of nitrate of baryta to the liquor containing the 

 sulphates. 



TABLE No. 3. 



These figures show not only the rapid increase of solubility 

 of sulphate of baryta in multiple volumes of nitric acid 

 sp. gr. 1.167, but also that the formation of a precipitate 

 does not prevent the great solubility of this salt. 



Thus, in jar No. 2, there is 1.382 dissolved in 1000 grs. 

 No. 3, „ 1.670 

 No. 4, „ 1.957 

 Therefore in each successive jar there is 0.3 gr. more of sul- 

 phate of baryta dissolved for the same volume of acid. 



In the hope of producing a precipitate in all the jars of the 

 series, I employed a greater quantity of salts for the same 

 proportions of acid as above, and the results are given in the 

 following table. 



TABLE No. 4. 



