250 MANUAL OF BACTERIOLOGY. 



Streptococcus of Erysipelas. A streptococcus has been 

 derived from cases of erysipelas which in all essential re- 

 spects, in its morphology, its growth on culture-media, its 

 behavior with stains, and its pathogenic properties, is simi- 

 lar to the streptococcus pyogenes. It is probable that these 

 organisms are identical. 



Micrococcus tetragenus. Found in the cavities in the 

 lungs of pulmonary tuberculosis, in sputum and in pus. 



FIG. 60. 



Micrococcus tetragenus in pus from a large abscess on the arm ; showing 

 capsule, Gram's stain and eosin. (X 1000.) 



The micrococci are enclosed in a transparent capsule, best 

 seen in preparations from the tissues of inoculated animals, 

 and are arranged in pairs or in fours ; about I p. in diameter ; 

 not motile; stain by Gram's method. It grows well at the 

 room temperature, but rather slowly; is facultative anaero- 

 bic; does not liquefy gelatin. Gelatin plates show little, 

 white, punctiform colonies, which, with the low power, are 

 finely granular, and have a peculiar glassy shimmer ; and in 

 stab-cultures the growths appear as little colonies along 



