 
                
(Cover Terry)
                
 
            
                New Worlds No: 57 - Mar 1957
            
		
                
                    (Written As By Bertram Chandler)
                
            
	 
            
                Short Story
                ust to complicate the paradox of Time Travel Bertram Chandler this month intoduces a further innovation - whose past is the one most affected by the introduction of the Time traveller.