INOCULATION FOR PLEURO-PNEUMONIA IN CATTLE. 47l 
reality it is when first exuded from the wound, but it presently 
becomes altogether and entirely pus. Our experience therefore 
confirms that which we had anticipated with regard to these 
inoculations by removes , namely, that the effect would be both 
more certain and speedy, because pus was the material 
employed. Removes, therefore, cannot be effected on true 
or scientific principles. We have no materies morbi to be 
modified and improved by being passed through the systems 
of healthy animals in succession, as is the case with the primary 
virus of a smallpox vesicle. 
The occasional incubation of the so-called ce pulmonic 
virus,” after its introduction into the wound, of which fact 
we have recorded some notable instances, has been advanced 
as an argument in favour of its specific nature, and it has 
been said to agree in this particular with the poison of rabies. 
To this we reply, that when the rabid virus does come into 
operation, no matter how remote the period may be, it pro- 
duces that dreadful disease (rabies); but that when this 
supposed virus of Pleuro-pneumonia begins to act, it produces 
only local inflammation and ulceration. The cause of the 
serous fluid remaining now and then inert for three or four 
weeks may be somewhat difficult to explain ; but no more so 
than that of two animals receiving an injury at the self-same 
time by which some foreign agent enters the body, and the 
one being quickly affected with local inflammation in con- 
sequence, the other not being affected perhaps for some 
weeks. All pathologists are familiar with facts of this 
description. 
As to “ Jennerian principles” being the foundation of 
these inoculations of cattle, as has been stated by Dr. 
De Saive and others, we hesitate not to say, that, whatever 
else may belong to them, no principle expounded by Jenner* 
will be of the number. By vaccination, which, as we have 
shown, is essentially inoculation, Jenner either prevented the 
small-pox or mitigated its severity when it did occur. 
Pleuro-pneumonia, on the contrary, when occurring in an 
inoculated animal, is in no way lessened either in its severity 
or fatality by the inoculation of that animal with the so- 
called special virus of this disease. On this point there 
seems to be no diversity of opinion. Belgian, Prussian, 
Dutch, and English investigators agree here. We say 
nothing of France, as the report of her Commission has not 
yet reached us. 
We now come to a question to which allusion has pre- 
viously been made as affecting our credit, and which we find 
published in the Belgian report. It appears that two cows 
