342 



STUDIES IN [MMUNITY. 



one-half hour. After.", hours :it M7 (' slight hemolysis ispresent only 

 in the tube at one-half per cent (complete hemolysis if thedeposil of 



such a suspension is used), which shows thai not even at this tem- 

 perature is the toxic action of the "complement " entirely destroyed. 

 If we add ()."> of a cubic centimeter of fresh guinea-pig serum to an 

 analogous series of tubes, it is found that hemolysis is all but com- 

 plete throughout the series, that is, only the slightest "plugging" 

 has occurred. The combining ability of the dog complement is 

 impaired equally with and proportionately to the toxic ability. 

 The tables follow: 



TABLE I. 



TABLE II. 



Represents the actual volume present. 



TABLE III. 



