58 LS.C. Proceedings of the Ninth [N.S., XVIII, 
Oxidation reac- 
tions 
Primary change Secondary change 
Sodium sulphite +Oxygen Cobaltous hydrox- + Oxygen. 
ide 
a Ee + Nickelous hydrox- + os 
ide. 
"3 3 + ‘k Cuprous oxide + 53 
Sulphurous acid = + Air Ferrous sulphate + Air. 
f. 2 eet Stannous chloride + ., 
’ Ferrous  hydrox- + Oxygen Nickelous hydrox- + Oxygen. 
id ide. 
ide 
Cobaltous hydrox: + 2 ~ a » 
id 
ide. 
Manganous _hy- + 
droxide. 
Cevous hydroxide + 
Sodium sulphite + Air 
>? 
z o + » 
9 3? 
Sodium arsenite + Air. 
” ” gee Manganous_hy-+ ,, 
droxide. 
2% oS: Sodium  thiosul-+ ., 
. ate. 
Stannous chlo- + ,, Ferrous ammon + ,, 
ride sulphate. 
In all the above mentioned cases at first the primary 
change, that is, the oxidation of the easily oxidisable substance 
takes place and this primary change induces or promotes the 
secondary or the induced change that is the oxidation of the 
difficultly oxidisable substance. . 
In several of these induced reactions we determined the in- 
duction factors, but unfortunately hardly any conclusion could 
be drawn from these induction factors as to the mechanism of 
these changes. 
Oxidation has also been induced in the following substan- 
ces in presence of sodium sulphite which was itself oxidised 
by passing oxygen gas through the mixtures. 
Jrea, starch, grape sugar, cane sugar, potassium oxalate, 
sodium acetate sodium potassium tartrate, sodium formate, 
sodium citrate, acetone, chloral hydrate, chloroform, gly: cerol, 
quinine sulphate, sodium succinate, methyl alcohol, ethyl alco- 
ol, phenol, glutaric acid, maltose, potassium steerate, chole- 
sterol, anthraquinone acetanilide, brucine, phenolphthalein and 
gum arabic. . 
The oxidation of ferrous hydroxide, freshly precipitated 
and carefully washed free from alkali, by passing one 
through it in water induces the oxidation of the following sub- 
stances :— 
Urea, starch, grape sugar, cane sugar, potassium oxalate, 
