and naphthaline, and on a new acid produced. 159 



cubic inches of carbonic acid, or 153.46 grains, equivalent to 

 41.9 grains of carbon, and 25.89 grains of water, equivalent 

 to 2.877 grains of hydrogen. Hence 100 grains of the salt 

 yielded 



Baryta - - 27.57 - - 78 

 Sulphuric acid - 30.17 - - 85.35 



Carbon - - 41.90 - 118.54 



Hydrogen - 2,877 - - 8.13 



102.517 



In the second numerical column the experimental results are 

 repeated, but increased, that baryta might be taken in the 

 quantity representing one proportional, hydrogen being unity: 

 and it will be seen that they do not differ far from the follow- 

 ing theoretical statement. 



Baryta - 1 proportional - 78 



Sulphuric acid 2 ditto - - - 80 

 Carbon - 20 ditto - - 120 

 Hydrogen - 8 ditto - - 8 



The quantity of sulphuric acid differs most importantly from 

 the theoretical statement, and it probably is that element of 

 the salt, in the determination of which most errors are 

 involved. The quantity of oxide of copper and of acids 

 required to be used in that part of the analysis, may have 

 introduced errors, affecting the small quantity of salt em- 

 ployed, which when multiplied, as in the deduction of the 

 numbers above relative to 100 parts, may have created an 

 error of that amount. 



As there is no reason to suppose that during the combina- 

 tion of the acid with the baryta any change in its proportions 



