*Old Mother Nature 143 



germ killers. The battle never ends. A new drug is de- 

 veloped and proves effective for a while. But then strains 

 of germs resistant to that drug evolve, and a new drug must 

 be found. Who will win the battle — man or germs? It 

 is still anyone's guess. Perhaps with our more-or-less indis- 

 criminate use of drugs we are merely accelerating the devel- 

 opment of tougher and tougher strains of germs — strains 

 which will prove resistant to any of our drugs. 



Will the use of DDT result in the development of 

 tougher insects? Will the flies and mosquitoes of tomorrow 

 walk over a DDT-covered surface or fly through a mist of 

 DDT spray with no ill effects? We'll just have to wait and 

 see. 



