POWER OF ATTORNEY

	Know all by these presents, that the undersigned hereby
constitutes and appoints each of Jack H. Cleland, Melissa J.
Gambol, Linda E. Jolly, Lewis A. Steverson and R. Tony Tripeny
signing singly, his true and lawful attorney-in-fact to:

(1) execute for and on behalf of the undersigned the
application for EDGAR Form ID that is used to facilitate
electronic filings with the Securities and Exchange
Commission;

(2) execute for and on behalf of the undersigned Forms 3, 4
and 5 in accordance with Section 16(a) of the Securities and
Exchange Act of 1934 and the rules thereunder;

(3) do and perform any and all acts for and on behalf of the
undersigned which may be necessary or desirable to complete
the execution of any such Form 3, 4 or 5 and the timely filing
of such form with the United States Securities and Exchange
Commission and any other authority; and

(4) take any other action of any type whatsoever in connection
with the foregoing which, in the opinion of such attorney-in-
fact, may be of benefit to, in the best interest of, or
legally required by, the undersigned, it being understood that
the documents executed to this Power of Attorney shall be in
such form and shall contain such terms and conditions as such
attorney-in-fact may approve in his discretion.

	The undersigned hereby grants to each such attorney-in-
fact full power and authority to do and perform all and every
act and thing whatsoever requisite, necessary and proper to be
done in the exercise of any of the rights and powers herein
granted, as fully to all intents and purposes as the
undersigned might or could do if personally present, with full
power of substitution or revocation, hereby ratifying and
confirming all that such attorney-in-fact, or his substitute
or substitutes, shall lawfully do or cause to be done by
virtue of this power of attorney and the right and powers
herein granted.  The undersigned acknowledges that the
foregoing attorneys-in-fact, in serving in such capacity at
the request of the undersigned, are not assuming any of the
undersigned?s responsibilities to comply with Section 16 of
the Securities Exchange Act of 1934. Unless earlier revoked in
a signed writing, the undersigned grants such power and
authority to remain in effect until such time as he or she is
no longer required to file Forms 3, 4 or 5.

	IN WITNESS WHEREOF, the undersigned has caused this Power
of Attorney to be executed as of this 16th day of April, 2015.


							/s/ Mark S. Rogus