Animal Charcoal. 163 
to both at the same temperature. The result will show a 
prevalence of ozone in the water that has been subjected to 
quick evaporation by boiling, while in the other the unboiled 
sample precipitation of the gum will take place uncoloured, 
indicating a total absence of ozone.* 
The accepted theory of ozone among chemists is as of 
an active state of oxygen, and like the elementary prin- 
ciples of electricity, it is never generated otherwise than 
accompanied by a corresponding or induced quantity of 
another opposing element, axztozone,; although opposite 
and unlike in their nature, evincing properties positive and 
negative, yet having astrong mutual affinity fpr each other, 
they combine and become neutral when opportunity offers; 
and, in fine, bearing out their semblance to electric pheno- 
mena still more intimately, they may be again isolated, as 
just shown, by—1Ist, chemical decomposition ; 2nd, struc- 
tural arrangement, as in magneto-electricity ; and 3rd, by 
re-combination and disturbance of form, as in frictional 
electricity. The Franklinean theory as to the actual pre- 
sence or absence of a single principle, or the more recently 
accepted notion of the compound constitution of a subtle 
fluid here also equally applies; and the question arises, do 
there exist two distinctive elements—ozone, and antozone ? 
Or are these effects attributable to the intensity and relaxa- 
tion of asimple primary principle? By evaporation certain 
liquids may be ozonized, and the law applies equally to 
many others beside water, and ether. In the last experi- 
ment we generated an amount of the active element—ozone, 
and may reasonably anticipate a corresponding absence of 
this, or, an induced proportion of its coeval principle; let, 
therefore, the same experiment be repeated in the follow- 
ing manner :—Place ina boiling flask one ounce of distilled 
water, as before; some test paper must then be prepared 
as follows, a sheet of ordinary writing paper is to be satu- 
rated with the alcoholic test-liquid of gum guiacum and 
quickly dried over the flame of a spirit lamp, the colour of 
the paper should assume a light green tint. A strip of this 
paper is to be inserted into the neck of the flask, and the 
whole placed on a sand bath and moderately heated up to 
* The simplest manner of performing this experiment is to pour 
about one drachm of the water into a narrow test-tube and add 
about ten drops of test liquid, the gum in which will be precipita- 
ted of a characteristic white, its normal colour, or green, in inten- 
sity according to the amount of ozone present. 
