METHODS OF INOCULATION 



Examine two weeks later : the gelatine is completely 

 liquefied but clear, the yellow culture having sunk 

 to the bottom of the tube. 

 (9) Make a gelatine stab culture 



(a) with Staphylococcus pyogenes aureus ; 



(b) with Staphylococcus cereus flavus, and keep 

 the two tubes at 20 C. 



Examine after forty - eight hours : Staphylococcus 

 pyogenes aureus liquefies gelatine, rendering it at 

 the same time turbid. 



Staphylococcus cereus flavus does not liquefy it. 



