160 THE BACTERIOPHAGE 



motion, the discussion and the experiments of demonstration hinge 

 on the same facts; we only descend a step in the order of magni- 

 tude of the beings concerned. 



This same discussion may perhaps be renewed again some day 

 if we descend still another step; if we discover, for example, a 

 virus parasitizing the bacteriophage. The infinitely small is as 

 conceivable as the infinitely great; we have not the right to assign 

 limits to them. 



