622 



COLLECTED STUDIES IN IMMUNITY. 



TABLE II. 



In a control series (Table II, B), the sediment from 1 cc. 5% guinea-pig 

 blood was mixed with 0.35 cc. horse serum plus the decanted fluids from 1 cc. 

 5% guinea-pig blood. The latter had also been digested with decreasing 

 amounts of inactive ox serum, without, however, having previously been 

 treated with horse serum. The result is shown in Table III. 



TABLE III. 



The table clearly shows that the guinea-pig blood does not absorb 

 the active principle of the ox serum even when the blood is first 

 digested with horse serum. We were able to confirm the result 

 by repeating the experiment several times. The assumption of 

 Bordet and Gay, according to which the hypothetical colloid of 

 ox serum (the carrier of the hssmolytic action) is bound by blood- 

 cells which have been digested with horse serum, is thus shown 



