654 STABILITY OF BACTERIAL SUSPENSIONS. II 



SUMMARY. 



1. Measurements have been made of the potential and of the co- 

 hesive force at the surface of Bacillus typhosus and the bacillus of 

 rabbit septicemia in solutions of various salts and acids. 



2. Electrolytes in low concentration (0.01 n) affect primarily the 

 potential, and in high concentration decrease the cohesive force. 



3. As long as the cohesive force is not affected, agglutination occurs 

 whenever the potential is reduced below about 15 millivolts. 



4. When the cohesive force is decreased the critical potential is 

 also decreased, and in concentrated salt solution no agglutination 

 occurs even though there is no measurable potential. 



