MODE OF ACTION OF BACTERICIDAL SERA. 125 



The same phenomenon is shown by the following protocol: 



TABLE IV. 



Control I. ifo cc. bouillon culture + 2 cc. 0.85% salt solution + 3 drops 



bouillon. Result, oo. 



" II. Sterility of the goat immune serum, 0. 

 ' ' III. " " " normal goat serum, 0. 

 " IV. " " " " guinea-pig serum, 0. Three drops of 



bouillon to each tube. 



All the tubes made up to an equal volume with 0.85% salt solution. 

 Kept in the thermostat at 37 C. for three hours. Finally, two drops of 

 each plated on agar. 



We succeeded in obtaining similar results in such experiments 

 with the following combinations : 1 



1 We should like to call attention to a case which we encountered a number 

 of times. We found that an immune serum obtained from a goat could be 



