462 
SIR B. C. BRODIE ON THE ACTION OF ELECTRICITY ON GASES. 
hydrioclic acid was 23‘8 cub. centims. ; deducting from this 03 cub. centim., we have 23’5 
cub. centims. as representing the oxidation effected by the ozone, whence R=^L-^=l-88. 
An experiment conducted in a perfectly similar manner, but with an exceedingly dilute 
solution of hydriodic acid, of which 256 cub. centims. contained one gramme of iodine, 
14*25 
gave for the value of R, R= IT 4. 
The following Table contains the record of a series of experiments made, precisely as 
were the experiments just described, with solutions of hydriodic. acid, varying in their 
degree of concentration, which ranged from a solution containing one gramme of iodine 
in one cub. centim. to a solution containing one gramme of iodine in 256 cub. centims. 
For reasons which will presently appear, I have recorded in this Table all the experi- 
ments, without exception, which I have made upon this subject in the same way. 
In column I. is given the degree of concentration of the hydriodic acid employed. In 
column II. is given the “ titre” of a pipette of the gas with neutral iodide of potassium, 
T, as represented by the cub. centim. of hyposulphite of soda necessary for the titration. 
In column III. is given the “titre” of a pipette of the same gas with hydriodic acid, 
S, similarly represented. In column IV. is given the ratio of the oxidation effected in 
s 
the hydriodic acid to the oxidation effected in neutral iodide of potassium, R= 
I. 
II. 
III. 
IV. 
Degree of concentration of the solution of 
T 
S. 
E— S . 
hydriodic acid employed. 
1 . 
1 gramme of Iodine in 1 cub. centim 
19 
36 
1-89 
2. 
n 
19 
36 
1-89 
3 . 
1 gramme of Iodine in 2 cub. centims 
19 
37-7 
1-98 
4 . 
55 55 
19 
37-2 
1-96 
5. 
5 » 55 
14-7 
33-3 
2*24 
6. 
59 59 
14-7 
32*3 
2*20 
7 • 
55 5 » 
12-5 
29-7 
2-37 
8. 
59 55 
12-5 
29-7 
2-37 
9- 
1 gramme of Iodine in 3 cub. centims 
23 
42*2 
1-83 
10. 
55 5 5 
23 
46-7 
2*03 
11. 
95 99 
23 
48-7 
2-11 
12. 
55 55 
23 
47-2 
2-05 
13. 
55 59 
15 
27-6 
1-84 
14. 
55 99 
15 
28-2 
1-88 
I 15. 
1 gramme of Iodine in 4 cub. centim? 
19 
35-6 
1-87 
16. 
55 59 
15-5 
33-3 
2-15 
I 7 . 
55 55 
12-5 
24*6 
1-96 
j 18. 
55 5 5 
12-5 
25-1 
2-00 
19. 
55 5 5 
14-7 
32-3 
2-20 
20. 
1 gramme of Iodine in 6 cub. centims 
23 
46*1 
2-00 
21. 
55 5 5 
23 
44-1 
1-91 
22. 
55 '9 
20 
35-5 
1*77 
23. 
>5 59 
18-7 
40 
2*13 
24. 
55 59 
18-7 
38*5 
2-05 
25. 
55 5 ? 
15 
27*2 
1*81 
26. 
15 
29-5 
1-70 
