NEW RESEARCHES UPON PLEURO-PNEFMONIA, ETC. 
354 
This is the object of the second part of this paper. I hope to 
prove to you, gentlemen, that my experiments and doctrines of 
thirty years ago, relating to bovine pleuro-pneumonia and to the 
inoculation of that disease, after having been criticised, fav from 
being mythical or utopian, as considered by some, offer to-day as 
then, and more than at that time, characters of an incontestable 
exactitude. They are based upon positive facts, and a rigorous 
observation of the phenomena which take place in the order of 
nature. 
The principles [ expressed on this subject, in my first publica¬ 
tions, have become more evident as time and experience have 
progressed. I resume them in the following fundamental propo¬ 
sitions. I will explain some extensively, placing at the disposi¬ 
tion of the Academy the demonstration of the others, if it is its 
desire to open a discussion upon the important question of the 
preventive inoculation of bovine pleuro-pneumonia: 
X. Exudative pleuro-pneumonia is a general and specific dis¬ 
ease (totis substantiae). 
II. It is contagious, inoculable by miasma or volatil, and by 
fixed virus. It never originates spontaneously. 
III. Inoculation produces a general disease, similar in the 
whole to that which is known as exudative pleuro-pneumonia. 
IV. Exudative pleuro-pneumonia attacks, with rare excep¬ 
tions, the same animal but once. 
V. Properly inoculated, the animal is protected from pleuro¬ 
pneumonia; he resists the contagion. 
VI. Inoculation produces no effect upon an animal cured of 
pleuro-pneumonia, nor upon one inoculated successfully the first 
time. 
VII. Pleuro-pneumonia is an affection proper and exclusive 
to bovines; it is not transmissible to any other animal, nor to man, 
either by contagion or direct inoculation. 
VIII. The pathological product of inoculation is as a whole, 
similar to the exudated matter in the lungs, or other organs of 
the sick animal. 
IX. The inoculated disease transmits exudative pleuro-pneu- 
monia only by re-inoculation. 
