SIR B. C. BRODIE ON THE ACTION OF ELECTRICITY ON GASES. 
451 
further, any errors arising from this cause being too minute for satisfactory appreciatior 
by the methods employed, and not essentially atfecting the results. — April 1873.] 
In the following experiments a pipette of electrized gas was passed through a small 
glass tube heated with a Bunsen burner, and the volume measured in the aspirator. In 
experiment 1 a pipette of gas was also passed through a solution of iodide of potassium, 
and the volume measured with the result given in the first line in the Table below. In 
column 4 the sum of the volume in the pipette and the “ titre ” of the gas is given. 
“ Titre.” 
Volume before the 
experiment. 
Volume after the 
experiment. 
Sum of the “Titre” 
and the volume of 
the gas before the 
experiment. 
Experiment 1 ... 
12-27 
270-53 
270-49 
12-27 
270-07 
282-55 
282-34 
^Experiment 2 ... 
12-27 
290-81 
303-24 
303-08 
This result is in perfect concordance with the experiments of Yon Babo and Claus f, 
who found, in the series of experiments before referred to, that the contraction which 
oxygen underwent under the influence of electricity was equal to the volume of oxygen 
represented by the titre of the gas, the mean of their experiments giving a contraction 
of 98’27 volumes for every 100 volumes estimated by titration. The experiments also 
of Andrews and Tait indicate the same conclusion, their last and most concordant and 
exact series of experiments giving (if I rightly understand them) a contraction of 93 to 
95 volumes for every 100 volumes of oxygen thus estimated^. 
It was a matter of interest to ascertain the way in which the ozone is affected by heat, 
and the amount of ozone capable of surviving at different temperatures. In the three 
following experiments a pipette of the electrized gas was passed first through a glass 
tube heated in a bath of definite and constant temperature, and then through a solution 
of iodide of potassium, the gas being finally measured in the aspirator ; the difference 
between the original “ titre ” of the gas and the “ titre ” after its passage through the 
heated tube gives the amount of ozone destroyed, which should correspond with the 
increment of volume as ascertained by measurement in the aspirator. 
In the first column of the following Table is given the temperature at which the 
experiment was made ; in column II. is given the “ titre ” of the gas before the expe- 
riment, T ; in column III. the volume before the experiment, V ; in column IV. the 
“ titre ” of the gas after its passage through the heated tube, T x ; in column Y. the sum 
of the “ titre ” before the experiment, and the volume before the experiment, T+V ; in 
column VI. the sum of the “ titre ” after the experiment, and the volume after the expe- 
* Although the “ titre ” of the gas happens to be the same in these two experiments, they were made with 
different gases at different times. 
t Annalen der Chem. u. Pharm., Supplementband ii. p. 303. 
t Philosophical Transactions, 1860, vol. cl. p. 123. 
MDCCCLXXII. 3 Q 
