1 8 IMMUNE SERA. 



The relation existing between complement, im- 

 mune body (i.e., amboceptor)- and erythrocyte is 

 shown in the accompanying figure reproduced 

 after Levaditi, a pupil of Ehrlich. 



i. n. 



zymotoxic group 



f 



1 



COMPLEMENT 



hatophore group 

 complimentophile gr. 

 IMMUNE BODY 



:ytophile group 

 receptor 



CEL: 



FlG. I. 



Difference between a Specific Serum and a Normal 

 One. The difference, then, between a specific hcemo- 

 lytic or a specific bactericidal serum and a normal 

 one consists in this that the specific serum contains 

 an immune body which is specific for a certain cellu- 

 lar element and by means of which the complement 

 present in all normal serum can be concentrated on 

 this cellular element to cause its solution. We shall 

 return to this subject later. 



Diverging Views of Ehrlich and Bordet. Now if 

 we recall the first experiments of Bordet and his 

 conclusions respecting the manner in which the 

 factors concerned acted, we shall at once see how 

 Ehrlich and Bordet differ. Bordet assumes that 

 the substance sen sibilat rice (the immune body) 

 acts as a kind of mordant on the red cells or bac- 



