1922.] Indian Science Congress. 1.8.C. 61 
bable therefore that the phenomenon of negative catalysis is 
possible only when the catalyst is liable to be oxidised. These 
cases are of great importance in connection with the contro- 
versial question of negative catalysis. 
Ina previous paper (Dhar Jour. Chem. Soc, 1917, IIT, 707) it 
quantity of alcohol. Now all these negative catalysts are good 
reducing agents, and are themselves readily oxidised. Hence 
in oxidation reactions the phenomenon of negative catalysis 
takes place when the catalyst itself is liable to be readily 
oxidised. 
If we expose a mixture of sodium sulphite and sodium 
hich is fai j ld become a slow change, the 
which is fairly rapid, shou tae equal 60 shad of ths 
oxidation of sodium arsenite, because the same amount of 
oxygen will be taken up by the reducing agents in the same 
time. As a matter of fact hear our a ig somalia 
b : i rs) jum arseni 
observed that in presence psy ante hydroxi ie thi 0k08- 
ity of the oxidation of sodium sulphite by air becomes very 
f oxygen splits up in 
small. We assume that a molecule o fly ero one of the 
ents. 
reagan than a solution o 
much more readily oxidised than the other oxygen atom 
