260 PATHOGENIC BACTERIA. 



low degree of heat. They stain well with aqueous solu- 

 tions of anilin dyes and also by Gram's method. 



The colonies upon gelatin and the development in 

 gelatin tubes, upon agar-agar, and upon blood-serum 

 are identical with the descriptions of the Streptococcus 

 pyogenes. No growth occurs on potato. 



The growth in bouillon is generally luxuriant, and in 

 a short time causes the medium to be filled with chains 

 of the cocci. As the growth progresses these chains 

 gather in clusters and fall to the bottom as a whitish 







Fig. 56. — Streptococcus erysipelatis, seen in a section through human skin ; 

 x 500 (Frankel and Pfeiffer). 



granular precipitate, above which the liquid remains 

 clear. 



When injected into animals Fehleisen's coccus behaves 

 exactly like the Streptococcus pyogenes. 



Observation has shown that dire results may follow the 

 entrance of this organism into exposed wounds, and that 

 it causes not only local suppuration, but sometimes a 

 general infection. 



The empiric experience that the occasional accidental 



