Fig. 53 



Receptors of the 2d order (Ehrlich). 



Fig. 1 Normal cell, with multiple specifi- 

 cally receptive molecular groups. Attacking 

 antigen ( ^). 



Fig. 2 Cell attacked at specifically recep- 

 tive point by antigen ( 4). This may be 

 bacteria, bacterial extractives, or proteins, 

 formed or amorphous. They stimulate the pro- 

 duction of agglutinins, eoagulins, precipitins, 

 etc. 



Fig. 3 Cell with equilibrium disturbed by 

 union of receptive cell* molecule \vith its 

 specific antigen / ErO\ 



Fig. 4 Cell in hypercompensation in effort 

 toward repair. Excess of bioplastie matter 

 This represents the antibodies: 



preeipitins, agglutinins, etc., of this order. 



Fig. 5 Cell restored. Excess of antibodies 

 float free. One seen in combination with its 

 antigen. 



