Meissner’s Researches on Oxygen, Ozone, and Antozone. 21 
PO, and PO,, as has long been known; HO,, as Schénbein 
discovered,’ and likewise NO,. As regards the last named sub- 
stance, Meissner states that its ae is but small, more of it 
— by phosphorus. 
in order to demonstrate the existence of NO,. For this purpose 
Meissner freed the liquid of PO, and PO, by BaO, made it 
alkaline with KO, and, after suitably concentrating, examined it 
for NO, by means of FeO ilute SO n a few in- 
of KI mixed with starch. Meissner assures us that this reaction 
is entirely attributable to a product of the action of ozone upon 
an ingredient of the organic matter of the sponge, viz: todine ; 
and that, on concentrating the water pressed from the sponge and 
adding to it sulphurous acid, a copious separation of iodine 
occurs. This reaction demonstrates that iodie acid, which de- 
com I wit , gave the reactions from which Schénbein 
deduced the formation of NO, in the slow combustion of phos- | 
phorus. hes : 
In the examination of the so-called phosphatic acid, Meissner 
found evidences of the presence in it of another substance, pos- 
sessed of reducing properties, opposed to the oxydizing Pa md 
of antozone. As previously observed, solution of pure KI, free 
O,, when acidified, after some time suffers decomposition 
with separation of I, and the rapidity as well as the extent of 
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