1890.] on dilute solutions of Nitrates and Nitrites. 55 



The method of working will be understood by the aid of the 

 diagram. 



A is an apparatus for generating H which passes through 

 a solution of silver nitrate in B, the nitrate of potash and the 

 CuZn couple are placed in C, while D contains the acid for 

 absorbing the ammonia. One vessel only is used to keep the 



