SUPPURA TION. 197 



coccus-infection, both general and local. Numerous 

 cases are upon record in which the serum seemed to exert 

 a beneficial action. 



It would seem as if an antiphlogistic serum should 

 occupy an important place in the future of medicine. 



The serum is prepared upon the same plan as that of 

 Behring, except that living virulent streptococci instead 

 of the sterile toxin are injected into the horse. 



BACILLUS PYOCYANEUS. 



In some cases the pus evacuated from wounds exhibits 

 a peculiar bluish or greenish color, from the presence of 



^*Vt- 



FIG. 56. Bacillus pyocyaneus, from an agar-agar culture; x IOOO (Itzerott 



and Niemann). 



the Bacillus pyocyaneus (Figs. 56, 57). This is a short, 

 delicate bacillus of small size, measuring 0.3 : 1-2 /, ac- 

 cording to Fliigge, frequently united in chains of four or 

 six. It has round ends, is actively motile, has one 

 terminal flagellum, does not form spores, and can exist 

 with or without oxygen, though it is an almost purely 

 aerobic organism. 



It stains well with the ordinary solutions, but does not 

 retain the color by Gram's method. 



