30 A. W. Wright on the Action of Ozone, ete. 
attacked and quickly perforated by it. It seemed most prob- 
able then that the acid was the result of the action of the ozone 
upon the insulators, and experiments were made which entirely 
confirmed this supposition. 
To the exit-tube of the ozonizing apparatus described in the 
previous paper was attached one end of a vulcanized rubber 
tube a few inches long, the other end being slipped upon the 
glass tube of a small wash-bottle containing some thirty or 
forty cubic centimeters of water. Air was slowly driven 
through the apparatus, and, having been strongly ozonized by 
the action of the electricity, bubbled up through the water. 
is was continued for an hour and a half. At the end of 
this time common air was passed through the apparatus to dis- 
pe the ozone left in it, the tubes were removed, and the 
* 
time afterward, there was an unmistakable odor of sulphur- 
slightest evidence of any action upon the sulphur could be 
detected is was what might have been expected, for as the 
air often contains a small percentage of ozone, sulphur exposed 
to it would undergo slow alteration, with loss of weight, and it 
does not appear that anything of the kind has ever been 
observed. 
It is evident that while the ebonite is undergoing decomposi- 
tion by the ozone, the oxygen combines with the issuing sul- 
phur to form sulphurous oxide, which with the atmospheric 
moisture produces sulphurous acid, this in turn being converted 
into sulphuric acid by the further action of the ozone. The 
