NEW RESEARCHES UPON PLEURO-PNEUMONIA, ETC. 
515 
ingly vigorous and vivacious. The product of this culture will be 
inoculated to a series of animals; others will be exposed to the vapo¬ 
rization .of this liquid, and in all the vapors conveying the microbe 
will be allowed to penetrate into the organism of cattle by the 
natural roads of contagion. We will endeavor also to determine 
with precision the liquid best adapted to inoculate, and to pro¬ 
duce by culture a pure vaccine, abundant and always at the dis¬ 
posal of inoculators. I propose to treat exprof esso and with all 
necessary details that interesting question, and to present the 
Academy with this new work. 
Gentlemen, at the risk of abusing your kindness, I believe it 
my duty to offer you an adhesion to my principles, too important 
to remain unnoticed. 
Some days ago, I addressed letters to Mr. Bouley and to Mr. 
Pasteur, with a view to obtain their opinions upon the question I 
have treated before you. Allow me to read part of the answer 
of Mr. Bouley. This eminent colleague entertains the same hope 
concerning the reality of the discovery of the microbe of pleuro¬ 
pneumonia, and as to the positive service that it will render to 
operators in furnishing them with perfect and certain vaccine, free 
from heterogeneous elements. 
He says : “ This question (of the presence of a microbe in the 
virulent liquid of peripneumonia) I treated before Mr. Pasteur, 
in a few words, at a meeting of the Central Society of Veterinary 
Medicine, where Mr. Pasteur who is a member, had related the 
results obtained in its experimental researches on chicken cholora. 
I was surprised, in his laboratory, to observe the analogy, or 
rather the identity, in an objective point of view, between the 
lesions produced by the insertion of the virus of this cholera and 
those of the poripneumonic virus; and I had come to the conclu¬ 
sion that like the other, this one was constituted by microbes, 
whose abundant multiplication in situ would produce those lesions 
so nearly alike. It had been understood with Mr. Pasteur, that I 
would give him an opportunity to collect in an abattoir, some 
peripneumonic virus, to have it cultivated; but his other re¬ 
searches did not allow him to attend to this. His laboratory is 
full of chickens upon which lie is constantly experimenting, and 
