OTHER DISEASES OF DOMESTIC ANIMALS. 143 
blood of a small micrococcus or bacterium in the form 
of the figure 8, differing, therefore, in form from Bacil- 
lus anthracis, but also an aérobie. It may be cultivated 
in chicken-broth, neutralized by potash, while it soon 
dies in the extract of -yeast, which is so well adapted 
to Bacillus anthracis. 
The microbe of this disease may also be attenuated 
by culture, and it may be done more easily than in 
the case of anthrax, since it is not necessary to raise 
the temperature, as the bacterium of fowl-cholera does 
‘not produce spores under culture. Pasteur has there- 
fore been able to prepare an attenuated virus well 
adapted to protect fowls from further attacks of this 
disease. 
IV. Swine FEveEr. 
The disease affecting swine, which is called rouge, 
or swine fever, in the south of France, has been 
recently studied by Detmers in the United States, 
where it is also very prevalent, and by Pasteur in 
the department of Vaucluse. It is a kind of pnewmo- 
enteritis. 
These observers consider that the disease is caused 
by a very slender microbe, formed, like that of fowl- 
cholera, in the shape of the figure 8, but more minute. 
Others say that there is a bacillus which was observed 
by Klein as early as 1878 in swine attacked by this 
disease. In spite of the apparent contradiction, it is 
