Animal Charcoal. 161 
not by mechanical mixture not sometimes even in solution, 
but which in other cases unite with avidity forming com- 
pounds impossible otherwise to effect. The simplest type 
illustrative of this principle is in the gases oxygen and 
hydrogen in mixture. So long asthey remain undisturbed 
and maintained below a fixed temperature no change is 
known to take place. Chlorine and hydrogen when un- 
exposed to light, sulphur again and oxygen, nitrogen and 
oxygen, carbon and oxygen, each may exist mixed or in 
contact, without any change taking place, but should one 
or both elements of any of these combinations be freed by 
any cause from a chemical combination in the presence of 
each other, a secondary compound is at once created. 
Such is water, such is muriatic acid, sulphuric acid, nitric 
acid, and carbonic acid, such in fine are all the numerous 
organic compounds, with which chemistry abounds, and 
the ultimate cause effecting the majority of inorganic 
combinations. 
Ozone is a substance admitted by all authorities as par- 
taking of the general properties, but differing in certain res- 
pects from oxygen. Ozone is oxygen, but oxygen is not 
necessarily ozone. Ozone is the oxygen of combination, 
whether fixed in substance or free. When in combination 
iw is Satisfied, and loses all its. characteristics of ozone. 
When freed it is oxygen possessing all the energy of com- 
bination without the power of reconstitution. But oxygen 
is not the only substance capable of being rendered nascent. 
The compounds of chlorides of platinum and gold are 
instances in which chlorine is rendered nascent by the caty- 
lictic presence of a third body. It is to this property the 
combinations alluded to already are due, and every element 
possesses the same property when newly freed, from) an te= 
cent combination. 
Now, those Shh ade ine the capacity for oxygen 
and combining with it, are called oxides or acids; other 
substances, although possessing the affinity are not capable 
of uniting chemically with oxygen, but converting it into 
ozone. Three bodies, A BC, are present ; between A and 
B the affinity may be represented by 4, and are in com- 
bination ; between Band C there exists an affinity repre- 
sented by 3; between A C by o. A Band C may there- 
fore be in mixture together, and the compound substance 
A’B will be reduced when in presence of C to I, in its 
absence 4. If nowanother substance D, bearing an affinity 
_to B equal to 2, and to A and C too be added. When C 
