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 ; 



(&) 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. 



