332 
E. NOCARD. 
It was a typical specimen of those cases of fibrinous arthritis 
which I mentioned above. The bacteriological examination 
showed, among numerous ordinary microbes, such as staphylo¬ 
cocci, streptococci, coli bacilli or para-coli, a very small immo¬ 
bile bacteria, coloring with difficulty, not taking the germs, not 
coagulating milk, not growing on potatoes, not producing indol, 
in one word, belonging to the group of microbes known as 
pasteurellas, among which so many are highly pathogenous. 
Cultures made on various media confirmed my previous ex¬ 
perience and allowed me to isolate a typical u pasteurella, n 
whose extreme virulency was proved to me by inoculations. 
Inoculated at the dose of a few drops in the peritoneum of 
a guinea-pig or in the veins of a rabbit, this microbe killed in 
a few hours, from 6 to 18. At the post-mortem, severe lesions 
of haemorrhagic septicaemia were found resembling very much 
those of the very acute form of white scour; the microbe exists 
in abundance in the blood and in all the viscerae; and, curious 
fact, recalling what is observed in white scour, if the autopsy is 
not made immediately, the blood and all the tissues are invaded 
by various microbes, coming from the intestines or from the 
lungs and the cultures obtained from them resemble entirely 
that of white scour ; they are exceedingly rich in microbes of 
all kinds, among which it becomes difficult to find again the 
inoculated pasteurella. 
This point being established, the question was to know if 
this pasteurella was surely the agent of white scour, or if it was 
not, like the others, a microbe from the intestine and able only 
to promote the articular complication. 
What one is already acquainted with can be found again 
easily ; I took up again the study of the products taken from 
the calves previously destroyed, and I was fortunate enough to 
find ao-ain, in the middle of all the microbes already seen, the 
same pasteurella—equally pathogenous to the guinea-pig and 
to the rabbit—in the blood of the heart and in the umbilical 
clot of three out of the five calves killed before. I have since 
made the post-mortem of nine calves suffering with white scour. 
