794 



THE MECHANISM OF AGGLUTINATION 



that in the earlier experiments the potential measurements agreed so well with the 

 flocculation results, even in high salt concentrations, renders it very improbable that 



pH 



3 4-5 67_8 9IO 

 Concen+ra+ion of HCI X 10* 



Fig. 6. — Effect of increasing NaCl concentration on the acid agglutination of B. typhosus 

 )20ps 



Solf concenlroifion ccjuivalents per liter 

 Fig. 7. — Effect of salt concentration on the "cohesive force" 



these measurements are at fault. It may be shown directly that this is not the case 

 by suspending the organisms in various concentrations of acid with various total salt 



