COO BACTERIOLOGY. 



Streptococcus cereus flavus (Staphylococcus 

 cereus flavus, Passet).* Cocci which also occur in 

 pus, If cultivated in nutrient jelly the growth, which 

 is at first white, becomes lemon -yellow, somewhat 

 darker in colour than Streptococcus pyogenes citreus. 

 Microscopically Streptococcus cereus flavus corre- 

 sponds with Streptococcus cereus albus, and they both 

 form zooglbea of medium-sized cocci (diam. n6/x). 

 Inoculation experiments with both kinds gave nega- 

 tive results. Among the micro-organisms present 

 in pus a coccus has been described as occurring oc- 

 casionally, which is almost identical with Bacterium 

 pneumonia crouposce ; compare also Streptococcus 

 pyogenes (p. 195) and Streptococcus pyogenes aureus 

 (p. 197). 



Streptococcus erysipelatosus. Minute cocci 

 4 [L to *3 /x, occur in chains in human erysipelatous 

 skin, and in the fluid of erysipelatous bullae. They 

 occupy the lymphatic channels of the skin, and 

 spread along them as the disease progresses, f 



They can be cultivated artificially in nutrient gela- 

 tine or agar-agar, and produce typical erysipelas 

 when re-inoculated in man or animals.J The 

 characteristic erysipelatous blush is produced by 

 inoculating these micro-organisms in the ear of 

 a rabbit. In the human subject the disease was 

 produced in fifteen to sixty hours after inoculation. 



* Passet, ibid. 



f Lukomsky, Virch. Archiv, vol. Ix. 



\ Orth, Archiv fur Exp. Pathol. u. PharmacoL, Bd. i. 1873. 



