240 COLLECTED STUDIES IN IMMUNITY. 



It is hardly to be doubted that such variations of the complement 

 are responsible for the occasional failures of bactericidal sera in 

 practice, especially if we consider that in diseased conditions a marked 

 diminution or a disappearance of the complements can take place 

 (Ehrlich and Morgenroth, Metchnikoff, Wassermann, Schiitze and 

 Scheller). 



