THEORIES OF IMMUNITY. 



idea the reaction in hemolysis may be shown 

 thus : 



It requires the cell to be destroyed, the im- 

 mune body, and the complement. 

 The cell molecule contains .... H+X+X 

 The immune body molecule con- 

 tains H+27-HX 



The complement molecule con- 

 tains J7+L+X 



The complement is bound to the immune body 

 by one H group, the two to the blood cell by 

 the other II group in the immune body, and 

 then the L group in the complement may act. 

 In cases where two H groups occur, the different 

 affinities are indicated by capital and italics. 



The production of the immune body requires 

 blood cells injected, the cells of the body in 

 which the injection is made, and the complement. 

 The reaction is shown' thus: 



The blood cell molecule con- 

 tains H+N+X 



The body cell molecule con- 

 tains H+iJ+X+X 



104 



