SAIM'INA VKXTlilCULI 



247 



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

 process. 



Colony on the gclatii 

 plate 



Tetrad form of the sarcina 

 gi own on gelatine 



Superficial prominence 



Needle-track 



FIG. 91. THRUST-CULTURE ix GELATINK OF SAKCIXA VEXTRICULI, FOUR DATS OLD. 



The growth of this microbe does not affect albuminoid 

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

 cipitating caseine and changing milk sugar into lactic acid. 



