328 PATHOGENIC BACTERIA. 



fowls can first be inoculated with very weak, then with 

 stronger, and finally with highly virulent cultures, with 

 a resulting protection and immunity. Unfortunately, 

 the method is too complicated to be very practical. 



The bacillus of chicken-cholera seems not only to be 

 specific for that disease, but seems able, when properly 

 introduced into various other animals, to produce several 

 different diseases. Indeed, no little confusion has arisen 

 in bacteriology by the description of what is now pretty 

 generally accepted to be this very bacillus under the 

 various names of bacillus of rabbit-septicemia (Koch), 

 Bacillus cuniculicida (Fliigge), bacillus of swine-plague 

 (Lofner and Schiitz), bacillus of u Wildseuche " (Hiippe), 

 bacillus of " Buffelseuche " (Oriste-Armanni), etc. 



In 1885, Salmon' and Smith wrote upon a bacillus 

 which caused an epidemic disease of hogs in certain 

 parts of the United States, calling it the bacillus of 

 swine-plague, but at first regarding it as different from 

 the disease well known in Europe. This bacillus has, 

 however, now come to be regarded as identical with 

 that of chicken-cholera. 



The bacillus of "hog-cholera" of Klein, Salmon, and 

 Smith seems to differ from the one described in a few 

 particulars. It is actively motile, is provided with numer- 

 ous flagella, and produces upon potato a straw color 

 which may turn dark when old. It is said to resemble 

 very closely the Bacillus coli communis, and it is thought 

 by Smith to be a close ally of the Bacillus typhi murium 

 of Corner. 



