438 IMMUNOLOGY 



defense against reinfection. Both Chesney (1927) and Zinsser, 

 Enders and Fothergill (1939) state that the retieulo-endothelial 

 system may also be an important defensive mechanism, 



10. A discussion of nonspecific Wassermann reactions is given. 



References 



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 Citron, J. B.: Immunity — Methods of Diagnosis and Therapy and Their 



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 Citron, J. B.: Die Technik der Bordet-Gengouschen Komplement bindungs 



— Methode in ihrer Verwendung zur Serodiagnostik der Infektions- 



krankheiten speziell der Syphilis, sowie zur Eiweissdifferenzierung. 



Handbuch der Technik und Methodik der Immunitat., Kraus and 



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of the Reactions, J. Immunol. 18: 393, 1930. 

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