162 On Ozone and its Relations to 
is present D will decompose the compound A B by the 
superior attraction it has for A; in its absence the whole 
series will remain unaltered. Ozone, present in an uncom- 
bined state is characteristic of the body B. 
Those substances are ozonizable which have a capacity 
for free ozone, as just described, like animal and other 
charcoal, platinum and other bodies. The alkaline per- 
manganates and chlorates and like oxygen yielding bodies 
are ozonized. All oxygen possessing, including organic 
and decaying bodies, are ozonized, for, under some circum- 
stance, they may yield oxygen in a nascent state, that is, 
ozone. 
It is possible as referred to already to furnish ozone 
simply—first, by the decomposition of any substance con- 
taining oxygen in combination; second, to ozonize the 
oxygen of the atmosphere by animal charcoal or some other 
substance of which this may stand as a type; and thirdly, 
there is another and more important means of obtaining 
ozone employed by Nature in providing the atmosphere, the 
grand reservoir with that consential element. Water seems 
to bear the most intimate affinity for ozone. The atmosphere 
is known to contain it through the vehicle of moisture. It 
is found more plentifully on the face of the ocean, rarely in 
a covered and sheltered situation, never in an inhabited 
dwelling. Being an active principle, its energy is quickly 
concentrated and expended in the numerous ways Nature 
has ordained for its mission. How, then, is the supply 
maintained to compensate for the loss thussustained? As 
it is found in the presence of moisture, so it is generated by 
the moisture, by the vaporization perpetually going on at 
the surface of the ocean by the constant evaporation on the 
whole extent of the globe is maintained at a uniform quan- 
tity. But to verify this by experiment : the evaporation_of 
ether by a heated glass rod, furnishes a copious supply, and 
will even sustain contusion with platinum wire; the ozone 
test, solution of guiacum, if quickly dried on the surface of 
paper affords the characteristic indication of ozone in be- 
coming green. But the following perhaps is a more con- 
clusive experiment as to the generation of ozone by evapo- 
ration. 
Two test tubes, similar to those before alluded to, should 
be nearly filled with distilled water. In one case use water 
which has been exposed in the open air for a considerable 
time, say two or three hours, in the other case water which 
has been recently boiled. The ozone test should be applied 
