FURTHER STUDIES OX THE DYSENTERY BACILLUS. 315 



for complementing the immune serum, namely, active human serum. 

 Table II shows an experiment with this serum. 



TABLE I. 



Control 



r 0.3 

 I o.i 



I 0.3 



1.0 cc. (1/500 mg.) 



TABLE II. 



several thous. 



00 





 



Control 



0.1 



0.3 



0.3 



1.0 cc. (1/500 mg.) 



L T p to the present time I have tested the serum of six individuals 

 and found it active in five cases (four times in placental serum and 

 once adult serum) ; only once, in the case of a nephritis patient, was 

 the fresh serum ineffective for complementing. It may be mentioned 

 that one of these sera was my own, and this was considerably stronger 

 than the rest. Whether this property has any connection with an 

 active immunization which I underwent some four years previously 

 I shall leave undecided. 



