STREPTOCOCCUS PYOGENES 



337 



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, 

 vRosenbach, 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 



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- 

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