TRANSPLANTATION ANTIGENS AND HAEMAGGLUTININS 35 



Transplantation antigens and haemagglutinogens could thus be 

 intimately related. 



The activity of haemagglutinating sera seemed to be specifically 

 inhibited by various preparations of transplantation antigens. 

 Consequently a "haemagglutination inhibition test" has been 

 developed as a quick and simple method for the study of trans- 

 plantation antigens. So far, the biological assays (second-set 

 phenomenon) and haemagglutination inhibition tests have aWays 

 been in good agreement. 



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