154 



IMMUNIZATION 



"acme," 



after which an abrupt decrease of the 

 agglutinin takes place. From this time (the ninth 

 day in our case) the content of antibody is very 

 similar to that after passive immunization. After 

 a rapid decrease comes the regular slow one, which 



10 15 



Time in days 



FIG. 36. 



may be calculated as a monomolecular reaction. 

 The calculated values for this time agree very well 

 with the observed ones. The same is the case for 

 the values calculated on the assumption that the 

 quantity of agglutinin increases with constant speed 

 during the time of rapid increase. 



In order to corroborate these statements I repro- 



