SIR B. C. BEODIE ON THE ACTION OE ELECTRICITY ON OASES. 
87 
and for the amount per cent, of carbonic acid decomposed 
( 1 ) 1-52 
(2) 1-35 
(3) 1-94 
(4) 2-68 
Also the iodine-titre on 100 volumes of carbonic acid passed through the induction-tube 
in the four experiments is 
(1) 0-17 
(2) 0-11 
(3) 0-12 
(4) 0-12 
Similarly, the iodine-titre on 100 volumes of the sum of the titre and unabsorbed gas is 
(1) 7-54 
(2) 5-44 
(3) 4-1 
(4) 5-79 
And the iodine-titre on 100 volumes of oxygen formed in the induction-tube, as repre- 
sented by the contraction given in the last column, is 
(1) 23-29 
(2) 17-47 
(3) 11-97 
(4) 17-05 
The titre on 100 volumes of the sum of the titre and unabsorbed gas, although some- 
what higher than the titre on 100 volumes of pure oxygen as arrived at by my previous 
experiments, in which the maximum value of this titre was 6-52 per cent., is nevertheless 
not far removed from that titre ; but the titre on 100 volumes of the oxygen thus gene- 
rated by the decomposition of carbonic acid in the induction- tube is fully three times as 
great as that titre; and the proportion of 100 parts of oxygen converted into ozone is 
in the four experiments severally 
(1) 69-87 
(2) 52-41 
(3) 35-91 
(4) 51-15 
It is assumed in these remarks not only that the ozone thus produced in the decompo- 
sition of carbonic acid is an ozone essentially the same in kind as that formed by the 
action of electricity on pure oxygen, but also that no other substance is associated with 
it capable of decomposing iodide of potassium. But these assumptions might, for aught 
we know to the contrary, be incorrect : there may be more than one variety of ozone itself; 
or, again, some higher oxide of carbon might, in such an experiment, be formed by the 
