112 



ESSENTIALS OF BACTERIOLOGY. 



Bouillon. In bouillon an abundant growth takes place, and 

 this medium is used to obtain the toxins. 



FIG. 50. 



Bacillus diphtherise, from a pure culture. 

 FIG. 57. 



Bacillus diphtherise, from a culture upon blood-serum ; X 1000 (Fraukel and Pfeiffer). 



dning. Is not colored by Gram's method. Stained best 

 with Lomer's alkaline methylin-blue. 



