SARCINA VENTR1CULI 



247 



colours, and does not discharge the stain under Gram's 

 process. 



Colony on the gelatine 

 plate 



_ _ Tetrad form of the sarcina 

 ljj? giown on gelatine 



Superficial prominence 



Needle-track 



FIG. 91. THRUST-CULTURE ix GELATINE OP SAUCIXA VEXTRICULI, FOUR DAYS OLD. 



The growth of this microbe does not affect albuminoid 

 bodies, but it has the property, on the other hand, of pre- 

 cipitating caseiue and changing milk sugar into lactic acid. 



