372 
FOURTH INTERNATIONAL VETERINARY CONGRESS. 
Prof. Putz opposed the opinions of Mr. Leblanc; he was sur¬ 
prised that that gentleman should find that the disease produced 
by inoculation is not identical with pleuro-pneumonia. The same 
difference exists as to anthrax, which may at times be followed by 
death, without giving rise to the symptoms or characteristic 
lesions of the disease, bacterides only being found in the 
blood. 
He was convinced of the efficacy of inoculation, and his con¬ 
viction had become stronger as his experience had increased. For 
himself, two kinds of inoculation must be admitted : 1st the pre¬ 
ventive inoculation, and 2nd, that of necessity. The latter is 
more often abortive than the first, because the animals may 
be already diseased at the time of the operation. Preventive in¬ 
oculation had given him some very favorable results. 
Prof. Wehenkel considered the propositions of Mr. Bouley as 
too absolute and too broad. With him the questions relative to 
inoculations, is not yet completely decided. The argument of the 
testing ( criteres ) inoculation is not decisive. 
Experiments seem to prove that inoculation gives immunity 
against a second inoculation of the same virus, but it is not prov¬ 
ed that it generally resist the disease itself ; he would require that 
new experiments be made before deciding upon a principle so ab¬ 
solute as that expressed in Mr. Bouley’s propositions. 
Mr. TJlrich remarked that, upon the invitation of the Prussian 
government, he studied pluero-pneumonia in Belgium in 1852, 
had then exposed animals to contamination; the result of his ex¬ 
periments has been in favor of inoculation. Since then, he has 
continued to inoculate with success in Austria, Prussia and Bussia. 
Dr. Willems defended his prophylactic method. He said that 
the lesions of the cadaver were the same upon inoculated animals 
as upon those affected with the disease after a natural infection. 
Pluero-pneumonia is due to a microbe, he had observed, with 
Yan Kempen, a long time ago. Pasteur has also observed it and 
had been able to isolate or cultivate it separately from the other 
germs contained in the pulmonary lymph. 
The testing inoculation has a great value; it proves that im¬ 
munity is obtained by pleuro-pneumonia inoculation, to the same 
