STUDIES ON ANTIAMBOCEPTORS. 665 



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this is because the complementophile group of the amboceptor is 

 occupied by the antiamboceptor, whereby this point of attachment is 

 blocked for the complement as with a complementoid. 



Summing up the results of our experiments, we must conclude 

 that it is impossible longer to doubt the existence, in the antiserum, 

 of antibodies directed against hajmolytic amboceptors. It is possible 

 to differentiate them in their action, even when antibodies for 

 albuminous substances are present at the same time. This estab- 

 lishes the antiamboceptors as inhibiting substances sui generis. 

 By the formation of precipitates, the albumin-antibodies may, at 

 times, more or less favor the action of the antiamboceptors, without, 

 however, exhibiting the complement-binding power inherent in them. 



