340 The Exhalation of Ozone by Flowering Plants. [April, 
to judge, whether the ozone is derived from the silent discharges 
of pure and dry oxygen, or accompanies the electrolysis of water 
(and the smell is identical), is possessed by ozone only.” Ths 
odor is not peculiar to peroxide of hydrogen, for the same author 
says of this substance, “ The solution which I have prepared 
different times myself, carbonic acid being employed to decom 
pose barium peroxide, have not evolved any odor that I was able 
to recognize or perceive. Ozone is only slightly soluble in water, 
and is readily expelled on heating, while hydrogen peroxide is 
mixable, and solutions containing one per cent of peroxide o 
hydrogen may be concentrated by evaporation on the water bath 
until a higher degree of concentration is reached without gei 
loss of peroxide.’ ee 
The question, can ozone and peroxide of hydrogen coéxist® 
the same atmosphere? has also been oppositely discussed by 
chemists. Professor McLeod, as the result of his investigations 
(Chem. News, Vol. XL, p. 307), concluded that these two bodies dè 
compose one another. From this fact he further argues that it 
extremely improbable that ozone and peroxide of hyd i 
both formed during the slow oxydation of phosphorus. pn : i 
other hand Schöne, by an elaborate series of experiments | r 
by Leeds) shows that when strongly oxydized oxygen, Com e | 
5.2 volumes per cent of ozone, is agitated with an hydrogen i 
oxide solution containing 0.4 per cent of the peroxide, of a 
or four times as much as is necessary to destroy all Bees 
is only after the lapse of half an hour that as much a 
ozone is destroyed. Professor Leeds, in the article aire® 
ferred to, comes to the rescue of Schone, and very ao 
shows that not only ozone but also peroxide of hydroge® 
and that 
absolute 
slow, mutual decomposition takes place when toss" ~, 
ing to all the best authorities, peroxide of hydrogen ' i 
at a temperature of about 70° Fahr., while to 0e 2 
quires a temperature of about 200°. Fahr. The imp? i 
fact cannot be overrated, as it has a great DSS” © 
results of the present experiments. l 
1 See also Schöne, Ann. der Chem., 196, P- 
XXIV, p. 221. ' 
