248 MANUAL OF BACTERIOLOGY. 



It is said that streptococci may be agglutinated by serum 

 from animals immunized with streptococcus. 



Coley has recommended a bouillon culture of Streptococcus 

 pyogenes (or of erysipelas), in which the Bacillus prodigiosus 

 was afterward grown, to be administered by injection, after 

 sterilization of the cultures by heat, in cases of inoperable sar- 

 comatous tumors. These injections appear in some cases to 

 have accomphshed remarkable and wholly inexplicable cures. 



FiG.^-. — ^Micrococcus ieiragenus in I'us prom a Large Abscess on 

 the'Aem, Showing Capsule, Gram's Stain and Eosin. (X 1000.) 



Streptococcus of Erysipelas. — ^The cause of erysipelas is 

 a streptococcus which in all essential respects — in its mor- 

 phology, its growth on culture-media, its behavior with stains 

 and its pathogenic properties — corresponds 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. The 

 micrococci are enclosed in a transparent capsule, best seen in 

 preparations from the tissues of inoculated animals, and are 



