ANTIGENIC PROPERTIES 119 



without preventing adsorption is not known, but mechanisms 

 are not difficult to imagine. Nor is it difficult to understand, in 

 oudine, how attachment of antibody at other sites on the phage 

 might even, by altering the distribution of surface charges or in 

 other ways, facilitate adsorption rather than inactivate the phage 

 (Hershey, Kalmanson, and Bronfenbrenner, 1944- Sao-ik 1954- 

 Jerne, 1956). ' ^ ' 



