Is S '?. 



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m s 



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V:. 



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■ i , ■ » ^ 



Figure 3 



":'<-;•■ '.t-\ 



THE QUELLUNG PHENOMENON 

 Figure 3. Pneumococci from the peritoneal cavity of a mouse mixed 

 with concentrated homologous immune serum. Figure i. Pneumococci 

 from the peritoneal cavity of a mouse mixed with concentrated homolo- 

 gous immune serum; particularly marked Quellung and mass formation. 



