120 RICHARD MCKEON 



nomles and paradoxes of matter and energy, matter and 

 antimatter, machine and organism, simple and composite, 

 motion and rest. We have nothing to learn concerning the 

 substance of the twentieth century problem from what was 

 known about elements in the twelfth century or in the Renais- 

 sance, but the theoretic characteristics and consequences of the 

 opposed positions were thoroughly elaborated in the earlier 

 periods in statements which have echoes in contemporary 

 problems, and the ironical turn of history which transformed 

 rather than solved the problems of the earlier periods is prepara- 

 tion which might be useful for like transformations in the 

 problems faced today. 



Richard McKeon 



University of Chicago, 



Chicago, Illinois. 



