SIE B. C. BEODIE ON T1IE ACTION OF ELECTEICITY ON GASES. 
457 
experiment thus made with protochloride of iron, where T is the “titre” of the 
electrized gas, S the amount of oxygen corresponding to the actual oxidation effected, 
and R= r j,. 
1 
T. 
s. 
B=|. 
3-197 
3-218 
1-00 
In two experiments with protosulphate of iron, putting T as the original “ titre ” of 
the gas and T t as the “ titre ” of the gas after its passage through the solution of proto- 
sulphate, T— Tj as the difference of the two “ titres,” S as the oxidation actually 
effected in the solution of protosulphate, and R= - — the following results were 
1 1 L 
obtained : — 
T. 
T r 
T— TV 
S. 
S 
r -t-iy 
1-124 
0-080 
1-044 
1-003 
0-97 
1-122 
0-134 
0-988 
1-042 
1-05 
From the discrepancy which existed between the oxidation of a solution of iodide of 
potassium, as indicated by the “ titre,” and the increment of weight of the same solution 
after the passage of the electrized gas, I was led to make the following experiment with 
a solution of protosulphate of iron, with the view of ascertaining whether or no a similar 
discrepancy would be found to exist in this case also. The experiment was arranged 
precisely as in the previous experiment referred to (p. 449). 
A current of electrized gas was passed through a bulb containing a measured quantity 
of a nearly saturated solution of protosulphate of iron, which was weighed with the drying- 
tube attached before and after the experiment. The gain in weight was ’2125 grin. 
The oxidation effected, as estimated by titration with a standard solution of permanganate 
of potash before and after the experiment, corresponded to *2184 gramme of oxygen. 
•2184 100 
Now TNjA 5 = 97 7 3 , fh e oxidation indicated by the titration being rather less than that 
shown by the gain in weight of the solution, and the discrepancy being in the reverse 
direction to the discrepancy in the former case. 
Hence it appears that the oxidation effected in these solutions exactly corresponds to 
and is equal to the “ titre ” of the electrized gas by which that oxidation is effected. 
The oxidation similarly effected in an acid solution of ferrocyanide of potassium and in 
a solution of arsenite of soda is of the same character ; the experiments, however, which 
I now proceed to lay before the reader belong to a different order of phenomena. 
