ON INOCULATION OF PLEURO-PNEUMONIA. 
409 
Belgic Commission takes account in its general report, is 
resolvable into — 
Fattening beasts . . . .2,732 
Lean or dry ditto . . . .2,189 
Calves and young cattle . . . 380 
5,301 
Inoculation succeeded, i. e, 9 manifested its operation by 
symptoms of appreciable local inflammation in 4*324 animals, 
of which 
2,030 lived in healthy stables. 
2,291 lived in infeeted stables. 
1,077 animals proved refractory. 
86 beasts (about the proportion of nearly 2 per cent, of animals in- 
oculated with local reaction) died from the effects of inoculation. 
301 (about 7*03 per cent.) lost part of their tail. 
71 (about 1*07 per cent.) lost the tail altogether; and 
75 (1*06 per cent.) contracted exudative pleuro-pneumonia, in spite 
of preventive inoculation. 
Such is the statistic resume of the report of the Belgic 
commission, in the precise form in which it has presented 
itself. Taking its amounts, grouped as they are, they mili- 
tate strongly in favour of inoculation, as a preventive means, 
since, in point of fact, they go to prove that the mortality 
attending on this operation is not more than one and a por- 
tion per cent., and that the benefit of immunity will be 
derived, through inoculation, to more than 96 animals in 100. 
But the Belgian commission did not suppose they had left 
their calculations with such a signification. 
As to that, the facts it has united in one account, with the 
view of presenting a general statistical resume , are divisible 
into three categories. 
The first comprises all facts tending to show that inocula- 
tion possesses really a preventive efficacy. This number will 
be about from 1*800 to 1000, according to the calculations 
we have made of them. 
In the second category, admitted by the Belgic commission, 
ought to be included all facts whose probative value, in favour 
of inoculation, is weakened, according to it, by the circum- 
stance that the effects of inoculation coincided with an action 
of disease in the intensity of the disease, and that, conse- 
quently, this actual immunity the beasts seemed to enjoy, 
might admit as well of explanation by this diminution of 
intensity of the epizootic, as by the operation of the preven- 
tive influence. 
Lastly, the third category embraces all the facts resulting 
from inoculation which has not proved preservative. 
