NiUtall and Strangeimiys 



319 



1. Quantitative Tests with Anti-Primate Sera. 



Tests with AntihuDian Serum (11. in. '02). Series i. 



The antiserum here used was obtained in the usual way by treating 

 a rabbit with human blood serum. The 45 bloods tested had been 

 preserved for various lengths of time in the refrigerator with the 

 addition of a small amount of chloroform. The only difference in this 

 series is that 1 : 40 blood-dilutions were used instead of the usual 

 1 : 100 dilutions, the usual amount of antiserum 0"1 c.c. being added 

 to "5 c.c. of the dilution. 



