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unless in a suburb when the wind is blowing from the country ; 
and it is only under the rarest and most exceptional conditions 
that it is found in the air of the largest and best ventilated 
apartments. It is, in fact, rapidly destroyed by smoke and other 
impurities which are present in the air of localities where large 
bodies of men have fixed their habitation, and I have often 
observed this destructive action extending to a distance of one or 
two miles from a manufacturing town, even in fine and bright 
weather.” 
On the other hand he says—“ Ozone is rarely, if ever, absent in 
fine weather from the air of the country, and it is more abundant, 
on the whole, in the air of the mountain than of the plain.” He 
further states that “the permanent absence of ozone from the air 
of a locality may be regarded as a proof that we are breathing, if 
I may venture to use the phrase, adulterated air. Its absence 
from the air of towns, and of large rooms, even in the country, is 
probably the chief cause of the difference which everyone feels 
when he breathes the air of a town, or of an apartment however 
spacious, and afterwards inhales the fresh or ozone-containing air 
of the open country. It is, indeed, highly probable that many of 
the most important actions, by which the products of animal and 
vegetable waste are removed by oxidation from the air, are due 
to the action of ozone, and could not be effected by ordinary 
or inactive oxygen.” 
Have we not in these statements, coming from so high an 
authority on matters of chemistry, when coupled with what was 
before said, a plausible explanation of the difference experienced 
by so many persons in the air of the lower parts of the town of 
Bath and the air or the hills, as also of the depressing effects of 
the former upon the system in certain cases ’—In hot weather 
especially everyone must have felt the relief on quitting the streets 
and getting into the open park, still more on ascending to higher 
ground when done without the fatigue of walking. I never 
_ myself found the effects of such a change so manifest as on one of 
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