36 
POPULAR SCIENCE REVIEW. 
draught ; and certainly an Ozone paper colours more quickly in 
a draught than it does in a calm air. But, after all, these facts 
bearing on the connection of Ozone with catarrh may be 
singular coincidences only ; it is hard to think so lightly of 
them, but it would be unsafe to think more. 
Speculation as to the influence of Ozone in the production 
of disease has been carried much further by some authors. 
It has been argued that croup, diphtheria, quinsy, bronchitis, 
inflammation of the lungs, and pneumonia, stand to Ozone 
in the position of effect to cause. Presuming that common 
cold is really a product of excess of Ozone in the air, there 
can be nothing more reasonable, or more fairly inferential, 
than that these other allied disorders follow upon the same 
cause ; and again, there can be no doubt that the disorders 
are most common and most fatal during the Ozone periods 
— i.e ., periods when Ozone is most active ; but for the same 
reasons as were given in regard to common cold, the evidence 
is not decisive. The evidence that has been accumulated 
ought never to be forgotten by the man of science, and no 
opportunity for extending it and improving it ought to be let 
slip ; but it cannot be accepted in any positive sense at this 
moment. 
We are assisted to some knowledge in relation to the 
possible effects of Ozone, as a disease-producing agent, by 
experiments, with excess of Ozone, on living animals. I have 
studied this point with some care, and have arrived at certain 
results exceedingly interesting to the man of science, and to 
all, indeed, who would know something of disease and its 
possible causation. In these experiments I charged air with 
Ozone until it was painful to breathe, and then filling a 
chamber with this air, and keeping the chamber supplied with 
it by means of a free current, the effect of a continued in- 
halation of the air was observed on animals of an inferior order. 
Without entering into details, I may state the facts that were 
thus elicited. 
In the first place, all the symptoms of nasal catarrh and of 
irritation of the mucous membranes of the nose, the mouth, and 
the throat, are rapidly induced. Then follow free secretion of 
saliva and profuse action of the skin, — perspiration. The 
breathing is greatly quickened, and the action of the 
heart is increased in proportion. Carried to an extreme 
degree, congestion of the lungs succeeds, and a well-known 
disease, which we physicians call te congestive bronchitis,^ 
is set up. The examination of the chest by the stethe- 
scope yields every physical sign of this disease, and the 
appearances of the lungs, if the induced malady be allowed to 
run to a fatal termination, leave no particle of evidence wanting 
