32 A New System of Logical Notation. 



Consequently, all Do Morgan's theorems, as stated 

 above, admit of interpretations in the common logic. 



The old logic, as perfected by the schoolmen and revived 

 by Whately, appeared to be a complete science, though 

 lying in a very narrow compass. But, as Mill remarks, 

 quoting from some unnamed writer, " on all great subjects 

 much remains to be said " ; and the science of logic is no 

 exception to this. The old, or common logic, is only one 

 corner of a vast and probably infinite field. 



