8 IMMUNE SERA 



the cell. IS In every living cell," Ehrlich says, 

 " there must exist a dominating body [Leistungs 

 Kern] and a number of other chemical groups or 

 side chains. These groups have the greatest variety 

 of function, but especially those of nutrition and 

 assimilation." 



The side chains, then, according to this author, 



toxophore group 



, POISON MOLECULE 



FlG. I 



are able to combine with the greatest variety of 

 foreign substances and convert these into nourish- 

 ment suitable to the requirements of the active 

 central body. They are comparable to the pseudo- 

 podia of the lower animals, which engulf food par- 

 ticles and assimilate the same for the immediate 

 use of the organism. In order that any substance 



