312 



BACTERIOLOGY. 



during life in the blood, expectoration, faeces, and urine 

 of patients sick of plague. He failed to find it in the 

 perspiration. 



Yersin states that it does not retain the color when 

 treated by the method of Gram; while Kitasato says 

 that it at one time stains by this method and at another 



Bacillus of buboric plague: A, in pus from suppurating bubo; JB, the 

 bacillus very much enlarged to show peculiar polar staining. 



becomes decolorized. Aoyama observed that those ba- 

 cilli within the suppurating glands were decolorized, 

 while those in the blood retained the stain when treated 

 by Gram's method. 



Since there is often a mixed infection in these cases, 

 it appears likely that the above discrepancy may be 



