STREPTOCOCCUS PYOGENES 355 



of pathogenic properties when injected into the circulation 

 of rabbits. Welsh regards this organism as a variety of 

 micrococcus pyogenes. 



STREPTOCOCCUS PYOGENES (ROSENBACH), MIGULA, 



1900. 



SYNONYMS: Streptococcus, Billroth, 1874; Streptococcus pyogenes, 

 Rosenbach, 1884. 



From a spreading phlegmonous inflammation prepare 

 cover-slips and cultures. What is the predominating 

 organism? Does it appear in the form of irregular clusters 



FIG. 67 







UV* 



jgjfI 



**r> / 



?& 



^ " 



Streptococcus pyogenes in pus. 



like those of grapes, or have its individuals a definite, 

 regular arrangement? (See Fig. 67.) Are its colonies like 

 those of micrococcus aureus? 



Isolate this organism in pure cultures. In these cul- 



