MYCOBACTERIACEiE: THE- BACILLUS OF DIPHTHERIA 



299 



On other media, such as glycerin agar, the morphological irregulari- 

 ties are less marked as a rule. The oganism in young cultures 





Fig. 119. — Bacillus of diphtheria. xiooo. 



Fig. 120. — B. diphtherice stsiiaed by Neisser's methoii. 



Stains readily, best perhaps with Loffler's methylene blue in 

 the cold. It is Gram-positive.' Old cultures stain with great 

 difl5.culty. 



