354 SUMMARY EXPOSITION OF EXPERIMENTS 
ditions, it became impossible to divine whether its develop- 
ment was owing to nullity of influence of inoculation as a 
preventive means, or to the pre-existence of the morbid germ 
which this operation would have been incapable of destroying. 
This necessary distinction established, here comes the sum- 
mary exposition of the experiments instituted by the Dutch, 
Belgian, and Lisle Commissions, together with the results 
such experiments have afforded. 
A. EXPERIMENTS OF INOCULATION ON ANIMALS IN 
PERFECT HEALTH. 
1 . The Experiments of the Dutch Scientific Commission . 
Nineteen cows were purchased under the vigilance of the 
commission at Scherpurzcel and Woadernberg, localities 
known to be free up to that moment from the ravages of 
peripneumonia. 
These cows, after having been submitted for some time to 
rigorous observation, were, with the exception of two, all 
inoculated, from the 1st to the 4th August, 1853, at the ex- 
tremity of the tail, according to the process recommended by 
Dr. Williams, and with matter taken from the lungs, as he 
pointed out. 
The inoculation proved mortal for one cow, involved the 
loss of the tail in another, and followed its ordinary course, 
without any heavy complication, with variable severity, in all 
the others, save one alone, in whom a first inoculation proved 
of no avail, and who was, four weeks afterwards, re-inocu- 
lated, though with no better success. . 
The 6th September, when all the phenomena produced by 
inoculation had ceased, we put into the same stable the 17 
inoculated animals along with 5 others coming from the same 
part of the country, but untainted by any inoculation, and 
intended to serve as subjects of comparison ; we also intro- 
duced into the same stable, successively, from the i6th Sept, 
up to the 8th of October, 5 animals affected with confirmed 
peripneumonia, and 1 besides, in whom the disease had a 
doubtful aspect, making altogether 6, of which 4 died and 
2 were cured. The number of days during which the sick 
animals remained in the stable, either all at the same time or 
in succession, in contact with the subjects of experiment, 
were 74 : without affixing any particular situation to the dis- 
eased animals, they were alternately put — the inoculated and 
the uninoculated animals, eating their food soiled with the 
other’s slabber. 
