264 RELATIONSHIPS OF THE COCCACE^E 



III. Cells in chains. Parasites. Growth meagre. Inulin not 

 fermented. No pigment. Genus, Streptococcus. 



A. Does not liquefy gelatin. 



a. Does not acidify lactose. 



1. Chains medium. Growth at 20 degrees 



feeble. Habitat, intestines of Her- 

 bivora. Acidifies saccharose, salicin, 

 and coniferin. Str. equinus. 



b. Acidifies lactose, saccharose, and salicin but not 



raffinose. Does not clot milk. 



2. Chains short. Habitat, human saliva and 



faeces. Str. mitis. 



3. Chains long. Hemolytic power marked. 



Found in pathological conditions. 

 Str. pyogenes. 



c. Acidifies lactose, saccharose, and raffinose but 



not salicin. Clots milk. Reduces 

 neutral red. 



4. Chains short. Habitat, normal mouth and 



intestine. Str. salivarius. 



5. Chains long. Hemolytic power marked. 



Found in cases of sore throat. 



Str . anginosus. 



d. Acidifies lactose, saccharose, salicin, coniferin, and 



mannite but not raffinose. Clots milk. 

 Reduces neutral red. 



6. Chains short. Habitat, human intestine. 



Str. facalis. 



B. Liquefies gelatin. 



7. Str. gracilis. 



