FUNCTIONAL DIFFERENTIAL EQUATIONS. 141 



pursued had been correct, it could not have given this solu- 

 tion. 



The preceding pages appear to contain the germ of a general 

 theory of differential functional equations ; a subject of great 

 extent, and ultimately, perhaps, of considerable importance. 

 But it cannot be denied, that hitherto the Calculus of Functions 

 has not led to many results of much interest. Its value arises 

 chiefly from the wide views it gives of the science of the com- 

 bination of symbols. 



