Securities and Exchange Commission

450 Fifth Street, N.W. Judiciary Plaza

Washington, DC 20549



Ladies and Gentlemen:



I hereby authorize Mary E. Bowler, Corporate Secretary and Corporate Counsel, or any Assistant Secretary, or their respective successors in office, to sign and file on my behalf SEC Forms 3, 4 and 5 or any other SEC forms relating to changes in beneficial ownership of securities of E.I. du Pont de Nemours and Company. This authorization shall remain in effect as long as I am a director of DuPont unless it is earlier specifically revoked by me.





Very truly yours,





/s/ Sean O'Keefe by Mary E. Bowler

Director









July 7, 2005