648 COLLECTED STUDIES IN IMMUNITY. 



anticomplementary effect of the ox serum. The anticomplementary 

 action, however, applies in the main only to a complement-like 

 constituent of horse serum, a constituent which causes the effective 

 horse complement to unite with an amboceptor b, although the 

 complement is effective only for amboceptor a. The phenomenon 

 described by Bordet and Gay, therefore, cannot be explained by 

 their interpretation, whereas all the experimental data are easily 

 understood on the basis of the amboceptor theory. 



