SIR 13. C. 33RODIE OX THE ACTIOX OF ELECTRICITY OX GASES. 
461 
oxygen with which it is associated, which are assumed to be separate and independent 
occurrences. The truth of this assumption, however probable it may appear, cannot 
be demonstrated by a priori reasoning; but if, proceeding upon this principle, it should 
be found that the ratio of the oxidation effected by the ozone to the “ titre” of the gas 
under varying conditions has a constant value, there is every reason to believe the 
assumption to be substantially correct. 
It is unnecessary to give the details of these experiments ; but I will offer one or two 
examples to explain the mode of proceeding. 
A pipette of electrized gas was passed through a neutral solution of iodide of potassium, 
which required for titration, after the passage of the gas, 12 '5 cub. centims. of the standard 
solution of hyposulphite of soda. 
A pipette of the same gas was passed through a bulb of hydriodic acid, 4 cub. centims. 
of which contained one gramme of iodine. The “titre” of the hydriodic acid, after 
the passage of the gas, was in two experiments respectively represented by 28'2 and28'7 
cub. centims. of the same hyposulphite of soda, deduction for the “titre” of the solution 
before the experiment having been made on the principles previously explained. Now 
3-61 is the number given in the Table as that of the cub. centims. of the same hyposul- 
phite of soda, which represents the oxidation due to the passage of a pipette of pure 
oxygen through a bulb of hydriodic acid of the degree of concentration employed in 
the experiment; subtracting this number from 28’2 and 28‘7 respectively, we have 24'6 
and 25 T as the numbers representing the oxidation due to the action of the ozone; and 
putting R as the ratio of the oxidation of the hydriodic acid to the “ titre” of the gas, 
24 *6 25*1 
we have, in the two experiments respectively, R=p^r = T96, and R=p^7=2 - 00. 
A similar experiment made with a solution of hydriodic acid, of which 2 cub. centims. 
contained one gramme, gave the following results : — 
The “titre” of a pipette of the electrized gas with neutral iodide of potassium was 
represented by 19 cub. centims. of the standard solution of hyposulphite of soda. 
The “titre” of a pipette of the same gas passed through the bulb of hydriodic acid 
was represented by 41 *8 and 41 ’3 cub. centims. of the same hyposulphite; the correction 
for the influence of the associated oxygen is 4T cub. centims. ; whence, subtracting this 
number from 4T8 and 4l\3 respectively, we have 37*7 and 37 - 2 as the cub. centims. of the 
standard solution of hyposulphite representing the oxidation effected by the ozone in the 
37’2 35‘6 
several experiments, and we have for the values of R, R= 1 ^ = 1*96, and R=-yy-=l , 87. 
The following experiment was made with a dilute solution of hydriodic acid, of which 
16 cub. centims. contained one gramme of iodine, on which the action of pure oxygen 
would be almost imperceptible, the deduction according to the Table amounting to no 
more than 0 - 28 cub. centim. 
The “titre” of a pipette of gas passed through neutral iodide of potassium was 12'5 
cub. centims. ; the “ titre” of a pipette of the same gas passed through the solution of 
3 e 2 
