JOHN H. NORTHROP AND PAUL H. DE KRUIF 



LOO 13.0 



647 



0.75 



to 







0.001 0.01 0.10 LO 



Salt concentrdtion,eqaivelents per liter 



Fig. 4. Effect of salts on the potential and agglutination of B. typhosus at 

 pH 2 (0.01 N HCl). 



10'' 10"" 10"^ 10"* 10-^ 10"^ 10"^ 1.0 



5alt concentration, equivalents- per liter 



Fig. 5. Effect of salts on the potential and agglutination of the baciUus of 

 rabbit septicemia Type D strain. 



