i^ig. 52 



Receptors of the 1st order (Ehrlich). 



Fig. 1. — Normal eeil, -with multiplicity of 

 receptive molecular groups. Attacking anti- 

 gen (-H-). 



Fig. 2. — Cell attacked at its specifically recep- 

 tive point by toxin molecule ( — H~). 



Fig. 3. — Cell equilibrium destroyed, by com- 

 bination of toxin molecule "with specific re- 

 ceptor (©-H*)- 



Fig. 4. — Cell in hypercompensation in effort to 

 repair injury indicated in 3- Specific receptive 

 molecules produced in excess (^-)- -A-11 not 

 required for repair float free in the blood as 

 antibodies — in this case as antitoxin. 



Fig. S. — Cell repaired. Antibodies floating 

 free. One combined with toxin. 



