AUGUSTUS WADSWORTH 837 



Wassermann technique to the complement fixation test with bacterial antigens, with 

 all factors completely controlled, so that it will provide an accurate titration of the 

 specific activity of the immune serum. Thus it is that, apart from the confirmation 

 and establishment of empirical observations, from whatever angle the student ap- 

 proaches the study of infection and immunity he must ultimately determine the 

 physical and chemical relation between the essential elements concerned in the re- 

 actions that take place. 



