INORGANIC RESPONSE 143 
abolition. Another notable point with reference to the 
action of this reagent is the persistence of after-effect. 

Before 4p After 
Fre. 91.—Drrressinc Errect or KBr (10 per Cent.) oN THE RESPONSE oF 
Tin 
IN 
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 
Before it After 
a stream of water. On Fic. 92.—ABoLiTIon oF RESPONSE BY 
Oxatic ACID 
replacing the wire in the 
cell, A gave the usual response, whereas that of B 
