Fig. S2 



Receptors of the 1st order (Ehrlich) 



Fig. ' Normal cell, with 

 receptive molecular groups, 

 gen 



multiplicity of 

 Attacking anti- 



Fig. 2 Cell attacked at its specifically recep- 

 tive point by toxin molecule ( 'I I ) 



Fig. 3 Cell equilibrium destroyed by com- 

 bination of toxin molecule with specific re- 

 ceptor (O-H-). 



Fig. 4 Cell in hypercompensation in effort to 

 repair injury indicated in 3. Specific receptive 

 molecules produced in excess (^). All not 

 required for repair float free in the blood as 

 antibodies in this ease as antitoxin* "* , 



Fig. 5 Cell repaired. Antibodies floating 

 free. One combined \vith toxin. 



