OTHEE DISEASES OF DOMESTIC ANIMALS. 143 



blood of a small micrococcus or bacterium in tbe form 

 of the figure 8, differing, therefore, in form from Bacil- 

 lus a/nthracis, but also an aerobie. 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 jaf 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 Fever. 



The disease affecting swine, which is called rouget, 

 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 pneumo- 

 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 baciUus which was observed 

 by Klein as early as 1878 in swine attacked by this 

 disease. In spite of the apparent contradiction, it is 



