OF ARTS AND SCIENCES. 



2C1 



of cupric nitrate and successive additions of water. The cupric sul- 

 phate formed by this treatment was wholly decomposed by electroly- 

 sis, and the resulting sulphuric acid was determined exactly in the 

 usual manner. The comparison of the acid solution before and after 

 electrolysis is capable of showing at once whether any sulphuric acid 

 was mechanically or chemically lost during the process. If any nitric 

 acid had been held by the sulphuric acid in the second case, it could 

 not have escaped decomposition during the electrolysis. 

 Following are the results : — 



Strength of H.2SO4 before Electrolysis. 

 Weights reduced to Vacuum. 



Strength of H2SO4 after Electrolysis. 

 Weights reduced to Vacuum. 



Difference between averages 



0.0003. 



Known mishaps tended to make the first experiments of each of 

 the two groups respectively too high and too low. It is seen that the 

 second experiments gave nearly identical results. Considering the 

 increased transference and manipulation involved in the second group, 



