1 56 PA THOGENIC BA CTERIA . 



The Staphylococcus aureus is not only found in the 

 great majority of furuncles, carbuncles, abscesses, and 

 other inflammatory diseases of the surface of the body, 

 but also plays an important role in a number of deeply- 

 seated diseases of the internal organs. Becker and others 

 obtained it from the pus of osteomyelitis, demonstrating 

 that if, after fracturing or crushing a bone, the staphylo- 

 coccus was injected into the circulation, osteomyelitis 

 would result. Numerous bacteriologists have demon- 

 strated its presence in ulcerative endocarditis. Rodet 

 has been able to produce osteomyelitis without previ- 

 ous injury to the bones ; Rosenbach was able to produce 

 ulcerative endocarditis by injecting some of the staphy- 

 lococci into the circulation in animals whose cardiac 

 valves had been injured by a sound passed into the 

 carotid artery ; and Ribbert has shown that the injection 

 of cultures of the organism may cause the valvular lesion 

 without the preceding injury. 



The Staphylococcus aureus is an easy organism to ob- 



FIG. 47. Streptococcus pyogenes, from the pus taken from an abscess ; x 1000 

 (Frankel and Pfeiffer). 



tain, and can be secured by plating out a drop of pus in 

 gelatin or in agar-agar. Such a preparation, however, 



