168 OZONE AND ANTOZONE. 
Schoenbein designated those bodies containing negatively active oxygen, 
(orO ), ozonides ; such are permanganic (Mn, 0, Os) and chromic acids (Cr2 03 Os), 
and the peroxides of manganese, (Mn 0,0), silver, (Ag 0,0), and lead, (BR 0,0). ) 
He named antozonides ; peroxides of hydrogen, (HOO), barium, (Ba OO), and 
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all bodies which contain oxygen in a positively active condition, (O), and this 
form of oxygen he called antozone. 
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This chemist succeeded in obtaining antozone (O) by projecting finely pow- . 
ok 
dered peroxide of barium (Ba OQ) into cold monohydrated sulphuric acid. A 
gas is evolved which both Houzeau and Schoenbein formerly supposed to be 
ozone, but which has different properties. It blues iodide of potassium starch 
paper, and smells somewhat like ozone; but when agitated with a little water 
it loses its odor completely, and forms peroxide of hydrogen, which reaction 
ozone does not produce. <A slip of filter-paper saturated with a mixture of 
dilute solution of ferricyanide of potassium and a persalt of iron is speedily 
turned blue in antozone gas, but in ozone behaves as in atmospheric air. A 
very small portion of the gas evolved by this reaction in antozone. ‘This is 
due to the elevation of temperature, which transforms the antozone into ordi- 
nary oxygen. 
Another means of distinguishing ozone from antozone consists in a slip of 
paper imbued with solution of sulphate of protoxide of manganese, which 
speedily becomes brown in ozone, from the formation of peroxide of manga- 
nese. In antozone, not only does this reaction not take place, but papers 
browned by ozone are bleached by antozone. 
A distinguishing test may also be found in the behavior of the two gases 
with permaganie acid, which antozone decolorizes and ozone browns. 
Dr. G. Meissner discovered that, if well dried electrified air be passed through 
water, (which may or may not contain air,) it forms, upon issuing into the at- 
mosphere, a more or less dense cloud or mist. ‘The same phenomenon takes place 
when electrified air issues into a moist atmosphere. 
This cloud is formed by the electrifying’ of either pure oxygen or of air; but 
not by pure hydrogen, or nitrogen. It occurs, whether the gas contains ozone 
or not, but in the latter case to a less degree. 
By contact with drying substances, as concentrated sulphuric acid, chloride 
of calcium, and even concentrated solutions of certain salts, the mist may be 
caused to disappear; but it forms again by the addition of aqueous vapor. 
The air left to itself gradually loses this mist-producing property, and if the 
antozone cloud be confined, the water is, after a while, precipitated upon the 
sides of the vessel, and can no more be produced by the action of vapor, unless 
the air be electrified again. 
Ozoniferous moist air retains its cloud-compelling property longer than that _ 
which does not contain ozone; and, on the-other hand, dry ozonized air pre- 
serves this property still longer. Meissner satisfied himself, by numerous ex- 
periments, that this phenomenon of mist is due to antozone, and that electrified 
air contains both ozone and antozone, the former element being absorbed, and 
the latter not absorbable by iodide of potassium, or pyrogallic acid. He dis- 
covered, also, that antozone prepared by electricity is identical with that obtained 
by the decomposition of peroxide of barium, as the former, when brought fresh 
and dry in contact with water, generates a proportion of peroxide of hydrogen. 
Meissner regards peroxide of hydrogen as a chemical compound of antozone 
and water; but cloud or mist as a physical aggregate of antozone and vapor 
of water, in which the chemical affinity of the two bodies is very much weak- 
ened. Von Babo supposes the antozone cloud to be in most cases peroxide of 
