46 IMMUNE SERA 



it will no longer possess any agglutinating action, 

 but will still combine with the bacteria. In other 

 words, the agglutinating group has been lost, the 

 haptophore has remained intact. Once the agglu- 

 tinating power is lost it cannot be restored, in which 

 respect the agglutinins differ from the bacterio- 

 lysins. 



