112 THE BACTERIOPHAGE 



phage active for the vibrio been found. This gave about fifty 

 plaques when planted on agar. In spite of many attempts it 

 has been impossible to cultivate it by serial transfers. None 

 of the fatal cases yielded a bacteriophage. 



The diversity of the bacterial types against which, up to the 

 present time, virulent strains of bacteriophage have been iso- 

 lated, suggests the idea that the activity of the bacteriophage 

 may be manifested toward any bacterial species whatsoever. 



