Fig. 54 



Receptors of the 3d order (Ehrlich). 



Fig. 1 Normal cell, -with multiple receptive 

 molecular groups. Attacking antigen (~J*)- 

 Complement in surrounding fluids =C. Note 

 that no complement is fixed by the cell re- 

 eeptors. 



O 



Fig. 2 Antigen attached to its specific affin- 

 ity. Complement is at once fixed 



(4) 



Fig. 3 Amboeeptor with attached antigen 

 and complement disengaged from cell, cell 

 equilibrium thereby impaired. 



Fig. 4. Cell in hypercompensation in effort 

 toward repair. Excess of bioplastic matter 

 ((JJM represents antibodies of this o.J?d)3^T ^yiC^h, 1 

 as bacteriolysins, hemolysins, cytoV/srri^, ^&tc\ < 



O 



r^ JL,o*- 



Fig. 3 Cell restored. Excess of antibodies ^' 

 free. No complement engaged, except in the 

 ease of union bet\veen antibody and antigen. 



