IMMUNIZATION 



155 



duce some figures given by Madsen and Jorgensen 

 for the content of agglutinin in a goat, which was 

 strongly immunized before the experiment against 

 typhoid bacilli. At the time indicated as o, i cc. of a 

 culture of typhoid bacilli was injected subcutaneously. 



Active Immunization of a Goat against Typhoid Bacilli 



(Madsen and Jorgensen) 



Here the time of incubation is reduced to 24 

 days, which is probably due to the previous strong 

 immunization, 136 units. The time of rapid increase 

 (6-6 days) lasts about as long as in the last case (6-5 

 days). The rapid decrease is not so pronounced 

 as in the last case. The final regular decrease 

 causes a sinking of the agglutinin to the half-value 

 in 1 1 days, whereas in the last case the corresponding 



