BACTERICIDAL TEST-TUBE EXPERIMENTS. 



135 



By varying the experiment I have succeeded with this same immune 

 serum in producing this phenomenon of deflection on another comple- 

 ment, thus furnishing evidence of the correctness of these views. 

 The source of this complement was an active normal goat serum 

 which in itself was bactericidal for the amount of organisms em- 

 ployed in the culture. (See Control II.) This experiment is other- 

 wise similar to the preceding, except that as additional control tests 

 the corresponding normal sera have been subjected to examination 

 respecting their deflecting power. 



B. 



Control I. s^ ff cc. bouillon culture + 2 cc. 0.85% salt solution = oo . 



" II. Normal active rabbit-serum 0.3+^J^ cc. bouillon culture = 00. 



" III. 0.4 cc. active pigeon-serum + -5^ cc. bouillon culture=oo. 



" IV. Sterility of all the sera, 0. 



