PLATE 58. 



Corynebacterium diphtheriae. (Klebs, Loffler.) L. 



and N. 



Corynebacterium pseudodiphtheriticum. (Hofmann- 

 Wellenhof.) Lehm. and Neum. 



Corynebacterium xerosis. (Kuschbert, Neisser.) 

 Lehm. and Neum. 



I. Coryneb. diphtheriae. Glycerin-agar streak culture, three 

 days at 37°. Luxuriant growth; culture moist. 



II. Coryneb. diphtheriae. Glycerin-agar streak culture, three 

 days at 37°. Delicate growth. 



III. Coryneb. pseudodiphtherit. Glycerin-agar streak culture, 

 three days at 37°. Luxuriant growth, culture moist. 



IV. Coryneb. xerosis. Glycerin-agar streak culture, three days 

 at 37°. Delicate growth; growth dry and dull. 



v. Coryneb. pseudodiphtherit. Glycerin-agar stab culture. 

 Surface growth, ten days at 37°. The culture is reproduced on 

 account of its atypical brown color. 



VI. Coryneb. diphtheriae. Gelatin stab culture. Surface 

 growth, ten days at 22°. The color fluctuates from white to dirty 

 yellowish. 



VII. Coryneb. diphtheriae : 



(a) Glycerin-agar plate. Colonies upon the surface, three 



days at 37°. Luxuriant growth. The same culture 



Natvu-al j as I. 



size. (b) Glycerin-agar plate. Colonies u|jon the surface, three 



days at 37°. Delicate growth. The same culture as 



n. 



VIII a. Coryneb. pseudodiphtherit. Glycerin-agar plate, t'olo- 

 nies lying upon the surface, three days at 37°. Natural size. 

 Luxuriant growth. Answers to culture III. 



VIII b. Coryneb. xerosis. Glycerin-agar plate. Colonies lying 

 upon the surface, three days at 37°. Natural size. Dry, dull 

 growth. Answers to culture IV. 



VIII c. Coryneb. xerosis. Glycerin-agar plate. Colonies lying 

 upon the surface, three days at 37°. Natural size. Delicate growth. 

 Sometimes it may be still more delicate. 



IX. Coryneb. diphtheriae. Potato culture, ten days at 22°. 

 The growth is typical, like a delicate veil, which in many places 

 leaves no trace on the potato. 



X. Coryneb. pseudodiphtherit. Potato culture, ten days at 

 22°. The growth is sharply outlined, white to dirty yellowish. 



