305 
Review. 
Quid sit pulchrum, quid turpe, quid utile, quid non.—H or. 
Air and Heater, their Impurities and Purification. By Henry 
' Bollmann Condy. London: John W. Davies, 54, Princes 
Street, Leicester Square ; 1862. 
{Second Notice.') 
In a previous number we reviewed a pamphlet by Mr. 
Condy on the above subject, extracting somewhat largely 
from it, and promising a second consideration of it. This 
we did because we found much, as we thought, that was 
interesting and important therein commented on. We then 
remarked that the agent advocated by him as a corrective 
owed its action to oxygen in its ozonic state. Ozone acts 
on all organized substances, whatever their condition; but 
its action on organic matter in the fresh or recent state is 
comparatively feeble; when decomposition, however, has com¬ 
menced, it manifests the utmost avidity for combination 
with the more oxidizable products which have been or are 
in the habit of being foi’med.Ozone is the 
great scavenging principle of Nature. So opposed is it to 
all foul and effete products of living organisms, that its 
presence in any given locality may be taken as a proof of 
the absence of those impurities which render the air unfit 
for use, and consequently as sufficient indication of the state 
of the atmosphere, with reference to its fitness for the 
purposes of respiration and the maintenance of health.^^ 
Ozone is the disinfectant par excellence, and Schdnbein, 
by experiment, found that atmospheric air containing but 
3^000 agerit, is capable of disinfecting its own volume 
of air loaded with the miasmata given off, during one minute 
of time, by four ounces of flesh in a high state of putrefaction, 
and that an extremely minute portion of ozone is sufficient 
to discharge the colour of a very large quantity of sulphate 
of indigo. 
xxxvi. 20 
