196 ESSENTIALS OF BACTERIOLOGY 



The pathologic actions are also similar. Field-mice are 

 immune, whereas for house and white mice the bacillus is 

 fatal in two to three days. 



Micrococcus of Mai de Pis (Nocard). Gangrenous 

 mastitis of sheep. 



Origin. In the milk and serum of a sheep sick with the 

 "md de pis" 



Fig. 99. Bacillus of mouse septicemia, from the blood of a mouse 

 ( X 1000) (Frankel and Pfeiffer). 



Form. Very small cocci, seldom in chains. 

 Properties. Immotile; liquefying gelatin. 

 Growth. Growth occurs best between 20 and 37 C., is 

 very rapid, and irrespective of oxygen. 



Plates of Gelatin. White round colonies, some on the sur- 



