6 4 



IMMUNE SERA 



solved all the widely distributed complement found 

 in normal serum. 



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. 



n. 



COMPLEMENT- 



IMMUNE BODY- 



CELL a 



zymotoxic group 



hatophore group 



complementophile gr. 



cytophile group 

 receptor 



FIG. 7 



Difference between a Specific Serum and a Normal 

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

 haemolytic 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 cellular element and by means of which the 

 complement present in all normal serum can be con- 

 centrated on this 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 



