SUPPURA TION. 1 95 



small cocci, forming long chains generally from six to 

 ten individuals, but sometimes reaching a hundred in 



FIG. 55. Streptococcus erysipelatis, seen in a section through human skin ; 

 x 500 (Frankel and Pfeiffer). 



number. Occasionally the chains can be found collected 

 in tangled masses. They can be cultivated at the room- 

 temperature, but grow much better at 30-37 C. They 

 are not particularly sensitive to the absence of oxygen, 

 but develop a little more rapidly in its presence. 



The erysipelas cocci, like the Streptococcus pyogenes, 

 are not motile, form no spores, and are destroyed by a 

 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 



