THEORIES OF IMMUNITY. 



The complement molecule con- 

 tains jy+L+x 



The two H groups in the tissue cell molecule 

 are used up, but must be reproduced; being re- 

 produced, this occurs in excess; they are thrown 

 off and exist free in the blood stream as 



H-h ZZH-X, which is the immune body. 



So with Bacteriolysis: the formulas are the 

 same, except in this instance the cell to be acted 

 upon is the bacterial cell, and not the blood cell: 



The bacterial cell, molecule con- 

 tains II+T+X 



The immune body, molecule con- 

 tains ...... H+//+X 



The complement, molecule con- 

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



As before the // groups in the complement 

 and the immune body combine, and then these 

 two are joined to the bacterial cell molecule by 

 the remaining H groups, and thus the L group 

 in the complement may exert its destructive 

 action upon the bacterium. 



105 



