Bacteriophagous antiserum 



137 



++ + -f = Complete inhibition CH = Complete hemolysis 



Experiment LH. The antibody and the antigens are the same as those 

 used in the preceding experiment . The following table presents the results. 



ANTIGENS 



IV 



++++ 

 ++++ 



Complete hemolysis 



Complete hemolysis 



H | C H | C H | 



Complete hemolysis 



No hemolysis 



C H 



It will be noted (experiment LI) that the antigen slightly fixed 

 complement with normal rabbit serum. This is not strange siDce 

 the bacteriophage is a normal inhabitant of the intestine. 



The antibacteriophage serum contains, therefore, an amboceptor 

 specific for the bacteriophage, whatever the strain may be, what- 

 ever the species of bacteria attacked, and whatever the animal 

 species from which it is derived. There is but one bacteriophage. 



