INOCULATION FOR PLEURO-PNEUMONIA. 579 
is, that there are animals who have been but imperfectly 
cured, whose lungs remain hepatized to a greater or less ex- 
tent, in whom the disease may run into the chronic from the 
acute stages, and be accompanied in that with all the pri- 
mary symptoms. 
The left lung is much oftener attacked than the right, 
though the contrary, without any cause assignable, happens 
in certain cow establishments, and, strange as it may seem, 
in this last case, the mortality is always greater. This is a 
fact I have uniformly observed at different dairies. The 
province of Cantal, whose sole agricultural produce consists 
in the rearing of cattle, sees its prosperity threatened every 
day by this devastating scourge ; every mode of treatment 
employed hitherto having proved without success. 
Inoculation alone, as recommended by Dr. Willems, was 
the only means held out to promise. For a long time I felt 
myself inclined to this operation ; I seemed to anticipate re- 
sults before I had obtained them, but knowing the great 
importance that such acts might be of, and feeling how ne- 
cessary it was to be cautious under the circumstances of 
advancing nothing save what a thorough experimentation, 
based upon the number of subjects and the time occupied, 
I have deferred my opinions up to the present moment. 
1. In the month of September, 18 52, I was called by M. 
Dubois, farmer and magistrate of Murat, to treat some beasts 
on the domain of Pesche. Pleuro-pneumonia prevailed in 
this flock with rare intensity; two thirds of it had perished. 
Inoculation proposed by me as a new means of experiment, 
was accepted by M. Dubois, Jun., and practised on fifteen 
beasts at the time in health. Since, this dairy has had no 
return of the disease. 
2. In February, 1853, M. Chaubassse, a lawyer at 
Allanche, desired my services for his dairy at Condour, in 
which pleuro-pneumonia had broken out with so much vio- 
lence, that out of ten sick beasts, eight had died (the right 
lung being always more affected). Inoculation was practised 
on seventy-two beasts, the lower two thirds of the tail being 
selected ; two of the animals only, with whom, probably, the 
disease was in a state of incubation, perished some days after 
the inoculation, while two others who failed to take inocula- 
tion, on the evidence of the farmer who believed them cured, 
died. The efficacy of inoculation is at this moment sub- 
mitted in this domain to a sort of counter-proof, which is the 
means of its being estimated at its true value. Last spring, 
M. Chaubasse purchased some cows to replace those which 
were dead. With these fresh beasts the disease re-appeared, 
