NATURE OF BACTERIOPHAGE 357 



pertaining to the bacteriophage must be interpreted to accord with the 

 fundamental estabHshed idea. To do otherwise is to adopt a faulty 

 system of logic. 



It is to this being, infravisible, parasitic of bacteria, that I have given 

 the name Protobios hacteriophagus (syn. Bacteriophagum intestinale) 

 d'Herelle, 1918. 



