54 



IMMUNITY 



FIG. 18 EHRLICH'S LATERAL CHAIN THEORY. Cell with numer- 

 ous receptors of various kinds and shapes to which are united the toxin mole- 

 cule. Note the free receptors. 



FIG. 19. EHRLICH'S LATERAL CHAIN THEORY. In one figure the 

 free receptors (anti-bodies) are united with the toxin molecule, the attached re- 

 ceptors have no haptophores united to cell. 



