INORGANIC RESPONSE 



abolition. Another notable point with reference to the 

 action of this reagent is the persistence of after-effect. 



Before 



After 



FIG. 91. DEPRESSING EFFECT OF KBr (10 PER CENT.) ON THE RESPONSE OF 



TIN 



This will be clearly seen from an account of the follow- 

 ing experiment. The two 

 wires A and B, in the cell 

 filled with water, were 

 found to give equal re- 

 sponses. The wires were 

 now lifted off, and one 

 wire B was touched with 

 dilute oxalic acid. All 

 traces of acid were next 

 removed by rubbing the 

 wire with cloth under 

 a stream of water. On 

 replacing the wire in the 

 cell, A gave the usual response, whereas that of B 



Before After 



FIG. 92. ABOLITION OF RESPONSE BY 

 OXALIC ACID 



