158 



WINSLOW, ROTHBERG AND PARSONS 



White and orange pigments on the other hand were fairly 



evenly divided among the various fermentative groups with a 



slightly greater preponderance of vigorous fermenters in the 

 orange than in the white groups. 



TABLE 5 

 General characteristics of 180 strains 



Habitat 



Pathogenic strains 



Strains from hands 



Strains from air, dust and other external habitats 



Chromogenesis 



White 



Orange 



Gelatin 



Liquefied 



Not liquefied 



GROUP III. 



ALL OTHER 



STRAINS 



11 



30 



29 

 20 



18 

 31 



REACTIONS IN MILK 



In addition to the study of the sugar broths the reactions of 

 the complete series in litmus milk have been determined with the 

 following results: 



Seventy-five strains acidified and clotted the milk and subse- 

 quently liquefied the clot. 



Sixty strains acidified the milk, generally with clotting, but 

 showed no subsequent liquefaction. 



Seven strains showed no appreciable change in reaction. 



Twenty-two strains turned the milk alkaline and liquefied the 

 casein. 



Sixteen strains turned the milk alkaline without liquefaction. 



Dudgeon (1908) obtained somewhat lower results, 6 per cent 

 of his orange and 48 per cent of his white strains clotting milk 

 and 2 and 7 per cent respectively of the two groups peptonizing 

 the clot. 



