Fig. 54 



Receptors of the 3d order (Ehrlich). 



Fig. 1. — Normal cell, with multiple receptive 

 nnoleeular groups. Attacking antigen (-• .) 

 Complement in surrounding fluids=C. Note 

 that no completnent is fixed by the cell re- 

 ceptors. 



Fig. 2. — Antigen attached to its specific affin- 

 ity. Complement is at once fixed 



(«) 



o" V 



Fig. 3. — Amboceptor with attached antigen 

 and complement disengaged from cell, cell 

 equilibrium thereby impaired. ^-^ 



Fig. 4. — Cell in hypereompensation in effort 

 toward repair. Kxeess of bioplastie matter 

 f^j represents antibodies of this order — such 

 as baeteriolysins, hemolysins, cytolysins, etc. 



Fig. S. — Cell restored. Excess of antibodies 

 free. No complennent engaged, except in the 

 ease of union between antibody and antigen. 



