THEORIES OF IMMUNITY. 



The production of the bacteriolytic power re- 

 quires the bacterial cell to be injected, the tissue 

 cell from which the immune body is to be 

 produced, and the complement existing in the 

 fresh blood stream. The reaction is as follows: 

 The bacterial cell molecule con- 

 tains H+T+X 



The tissue cell molecule contains H+JfZ-HN'-t-X 

 The complement molecule con- 

 tains ..... .ZZ-hL+X 



The H atom-groups in the tissue cell molecule 

 being taken up, are reproduced, cast off, and 

 exist free in the blood stream as 



H+iZH-X, the immune body. 



Cytolytic action may also be shown: 

 The cell molecule to be acted upon 



contains ..... H+N+X 

 The immune body molecule contains H-hfl-r-X 

 The complement molecule contains . J7-KL+X 



The H groups are joined together, and the L 

 group of the complement may then act. 



The production of the cytolytic property is 

 secured thus: 



106 



