94 IMMUNE SERA 



complement body, but only that part which affects 

 the digesting, solvent action. The part of the 

 complement concerned with the combination with 

 the inter-body or immune body, in other words, 

 that part called by Ehrlich the haptophore group, 

 must have remained intact. It is clear, therefore, 

 that anticomplements can only be formed when 

 there remain in the complements haptophore groups 



zymotoxic group 

 COMPLEMENT 

 haptophore group 



IMMUNE BODY 

 FlG. 9. 



that fit certain receptors in the organism of the 

 animal injected. From this it follows that the 

 complements consist of a combining haptophore 

 group which withstands heating to 55C., and 

 another more fragile group which possesses the 

 actual solvent properties, and which Ehrlich calls 

 the zymotoxic group. There is a perfect analogy be- 

 tween this and the toxins already studied. These, 

 it will be remembered, consist of a haptophore and 



