86 IMMUNE SERA 



obtained in this way of course contains only one of 

 the antihaemolytic bodies, the anticomplement, 

 and not the antiimmune body. This is because 

 normal serum is too poor in immune body (inter- 

 body) to excite the production of any antiimmune 

 body. 



If to a hasmolytic serum derived from guinea pigs 

 we add an anticomplement serum derived, as just 

 stated, from rabbits, and containing an anticom- 



COMPLEMENT 

 COMPLEMENT ^^ ^^ 



ANTICOMPLEMENT 



IMMUNE BODY _ _ BQDY 



CELL / *!%/ CELL 



(After Levaditi.) 



plement specific for guinea-pig complement, the 

 hgemolytic action of the former will be inhibited, for 

 the reason that the complement necessary for the 

 hsemolysis to take place has been bound by the 

 anticomplement. (See Fig. 8.) One must, how- 

 ever, observe the precaution to heat the anticom- 

 plement serum of the rabbit to 55C. before so 

 mixing it, in order to destroy the complement which 

 it contains and which would otherwise reactivate the 

 guinea-pig immune body. 



