UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON D.C. 20549

                                  SCHEDULE 14A
          Proxy Statement Pursuant to Section 14(a) of the Securities
                              Exchange Act of 1934

Filed by the Registrant [x]
Filed by a Party other than the Registrant [ ]

Check the appropriate box:

[ ]   Preliminary Proxy Statement
[ ]   CONFIDENTIAL, FOR USE OF THE COMMISSION ONLY (AS PERMITTED BY RULE
      14a-6(e)(2))
[ ]   Definitive Proxy Statement
[X]   Definitive Additional Materials
[ ]   Soliciting Material Pursuant to Rule 14a-12

                              HERCULES INCORPORATED
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               (Name of Registrant as Specified In Its Charter)



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   (Name of Person(s) Filing Proxy Statement, if other than the Registrant)



Payment of Filing Fee (Check the appropriate box):

[x] No fee required.

[ ] Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

      1) Title of each class of securities to which transaction applies:

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      2) Aggregate number of securities to which transaction applies:

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      3)Per unit price or other underlying value of transaction computed
        pursuant to Exchange Act Rule 0-11 (set forth the amount on which the
        filing fee is calculated and state how it was determined):

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      4) Proposed maximum aggregate value of transaction:

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      5) Total fee paid:

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[ ]  Fee paid previously with preliminary materials.

[ ]  Check box if any part of the fee is offset as provided by Exchange Act Rule
     0-11(a)(2) and identify the filing for which the offsetting fee was paid
     previously. Identify the previous filing by registration statement number,
     or the Form or Schedule and the date of its filing.

      1) Amount Previously Paid:

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      2) Form, Schedule or Registration Statement No.:

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      3) Filing Party:

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      4) Date Filed:

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[The following e-mail communication was sent to Hercules' employees on
July 18, 2003:]

Subject: Proxy Voting Instructions

        As our Annual Meeting of Shareholders quickly approaches, many of you
who own Hercules shares either through an employee plan or otherwise have
expressed concern about making sure you correctly vote and mail your proxy
cards.

        To help clarify the voting procedures, we have created a brief outline
describing how to vote your shares.

        We hope the outline addresses any source of confusion, but if you still
have doubts about how to vote your shares or where you should return your proxy
card, please contact MacKenzie Partners, Hercules' proxy solicitor, at (800)
322-2885, or Georgeson Shareholder Communications at (866) 288-2190. Georgeson
Shareholder Communications is the proxy solicitor for the Hercules Shareholders'
Committee For New Management (led by Sam Heyman), which is Hercules' opponent in
this year's proxy contest.

        As you know, unlike previous years, this year's Hercules proxy card is
GOLD, while the opponent's card is WHITE. Therefore, if you vote on a GOLD proxy
card, you will vote for Hercules' nominees; if you vote on a WHITE proxy card,
you will vote for the opponent's nominees.

        Note that, if you hold Hercules shares through the Hercules Incorporated
Savings and Investment Plan (the "Hercules Savings/401(k) Plan"), instead of a
proxy card you will receive an instruction form, which will also be GOLD if to
be voted in favor of Hercules' nominees, and WHITE if to be voted in favor of
the opponent's nominees.

     o  HOW TO VOTE YOUR PROXY CARD OR INSTRUCTION FORM:

           o  You may vote by signing, dating and returning your Gold or White
              proxy card or, for shares held through the Hercules Savings/401(k)
              Plan, your Gold or White instruction form. You should use the Gold
              proxy card or instruction form to cast votes for Hercules'
              nominees and the White proxy card or instruction form to cast
              votes for the opponent's nominees.

           o  You only need to sign, date and return one Gold or White proxy
              card or instruction form to vote your shares, unless you hold
              shares in multiple accounts, in which case you need to sign, date,
              and return one Gold or White proxy card or instruction form for
              each of your accounts. For example, if you hold shares in both the
              Hercules Employee Stock Purchase Plan ("ESPP") and the Hercules
              Savings/401(k) Plan, in order to vote ALL of your shares, you must
              return both a Gold or White proxy card for your ESPP shares and a
              Gold or White instruction form for your Hercules Savings/401(k)
              Plan shares.

           o  Once you have signed, dated and returned either a Gold or White
              proxy card or instruction form for all your shares, you do not
              need to sign any further proxy cards or instruction forms you
              receive (unless you want to change your vote as explained below).

           o  If you do sign multiple proxy cards or instruction forms for the
              same shares, the properly executed proxy card or instruction form
              that you submit with the LATEST DATE is the proxy card that will
              be honored - it will override all other previously signed, dated
              and returned proxy cards or instruction forms for those shares.
              However, if you have already returned a White proxy card or
              instruction form (in favor of the opponent's nominees) and then
              sign, date and return a new Gold proxy card or instruction form
              (in favor of Hercules' nominees), only the new Gold proxy card or
              instruction form will be honored and you will effectively have
              revoked your earlier White proxy card or instruction form (and
              your vote in favor of the opponent's nominees). Similarly, if you
              have already returned a Gold proxy card or instruction form (in
              favor of Hercules' nominees) and then sign, date and return a new
              White proxy card or instruction form (in favor of the opponent's
              nominees), only the new White proxy card or instruction form will
              be honored and you will effectively have revoked your earlier Gold
              proxy card or instruction form (and your vote in favor of
              Hercules' nominees).

           o  During a proxy contest, it is routine for the proxy contestants to
              send out several communications to keep shareholders informed. One
              or more of these communications may contain a new proxy card or
              instruction form. Receiving a new proxy card or instruction form
              does not indicate that the proxy card or instruction form that you
              previously mailed had not been received by the tabulation agent.

     o  IF YOU WANT TO VOTE FOR THE HERCULES' NOMINEES, SIGN, DATE AND RETURN
        ONLY THE GOLD PROXY CARD OR THE GOLD INSTRUCTION FORM FOR EACH ACCOUNT
        IN WHICH YOU HOLD SHARES. IF YOU WANT TO VOTE FOR THE OPPONENT'S
        NOMINEES RETURN ONLY THE WHITE PROXY CARD OR THE WHITE INSTRUCTION FORM
        FOR EACH ACCOUNT IN WHICH YOU HOLD SHARES.

     o  HOW TO CHANGE OR REVOKE YOUR VOTE AFTER YOU HAVE ALREADY RETURNED YOUR
        PROXY CARD: If you have previously signed, dated and returned a Gold or
        White proxy card or instruction form, you can change or revoke your vote
        by signing and sending in a later-dated Gold or White proxy card or
        instruction form, as long as that later card is received by the deadline
        explained below. As explained above, if you have already returned a
        White (or Gold) proxy card or instruction form and then sign, date and
        return a new Gold (or White) proxy card or instruction form, only the
        new Gold (or White) proxy card or instruction form will be honored and
        you will effectively have revoked your earlier White (or Gold) proxy
        card or instruction form.

     o  TYPES OF ACCOUNTS IN WHICH YOU MAY HOLD YOUR HERCULES SHARES

        PARTICIPANTS IN THE HERCULES INCORPORATED SAVINGS AND INVESTMENT PLAN:
        You may hold shares in an account in the Hercules Savings/401(k) Plan.
        If so, you will have already received mailings from Vanguard Fiduciary
        Trust Company, the Plan's trustee, explaining how to instruct the
        trustee to vote those shares. Plan participants may return their voting
        instruction forms to Vanguard via mail or fax (number: 1-877-226-7171).
        VANGUARD HAS INFORMED US THAT PLAN PARTICIPANTS MUST RETURN THEIR GOLD
        OR WHITE INSTRUCTION FORM SO THAT IT IS RECEIVED BY VANGUARD BY 4:00
        P.M. EASTERN TIME ON MONDAY, JULY 21, 2003, IN ORDER FOR VANGUARD TO BE
        ABLE TO PROCESS THE INSTRUCTIONS. NOTE THAT YOU CANNOT VOTE THESE SHARES
        DIRECTLY WITH A PROXY CARD: YOU MUST SEND VANGUARD THE GOLD OR WHITE
        INSTRUCTION FORM THAT VANGUARD HAS SENT YOU.

        BENEFICIAL OR "STREET" HOLDERS: Employees who hold their shares in
        "street" name - that is, through a bank or brokerage account (for
        example, if you purchased shares through Charles Schwab or other broker)
        - received both a Gold and a White Voting Instruction Form, and should
        return either a Gold Voting Instruction Form (for Hercules' nominees) or
        a White Voting Instruction Form (for the opponent's nominees) in an
        envelope addressed to ADP Proxy Services in Farmingdale, NY.

        REGISTERED HOLDERS AND PARTICIPANTS IN THE ESPP: Employees who hold
        actual stock certificates in their names representing their Hercules
        shares are registered holders. If you are a registered holder or are a
        participant in the ESPP you received both a Gold proxy card and a White
        proxy card. If you wish to vote for the Hercules' nominees, you must
        return the Gold proxy card in the envelope addressed to Mellon Investor
        Services in South Hackensack, NJ 07606. If you wish to vote for the
        opponent's nominees, you must return the White proxy card in the
        envelope addressed to Georgeson Shareholder Communications, 17 State
        Street, New York, NY 10004

        FIBERVISIONS 401(K) PROFIT SHARING RETIREMENT PLAN. Participants in the
        FiberVisions 401(k) Profit Sharing Retirement Plan (the "FiberVisions
        401(k) Plan") may give voting instructions for the shares in their
        accounts by returning either the Gold proxy card (for Hercules'
        nominees) or the White proxy card (for the opponent's nominees) they
        received, to Mellon Investor Services. Mellon has informed us that
        participants in the FiberVisions 401(k) Plan must return their Gold or
        White proxy cards so that they are received no later than 5:00 p.m. on
        Wednesday, July 25, 2003, in order for the instructions to be processed.

     o  IMPORTANCE OF VOTING YOUR SHARES

        Every vote is important no matter how many or how few shares you own. If
        you hold shares in registered holder form or in street name, your shares
        will not be voted unless you physically return a (Gold or White) proxy
        card. If you hold shares through one of the employee plans (other than
        the ESPP) and do not vote your shares, your shares will be voted by a
        plan fiduciary. Vote your shares as soon as possible by returning a Gold
        or White proxy card or instruction form.

     o  LAST DAY FOR MAILING PROXY CARDS

        PARTICIPANTS IN THE HERCULES SAVINGS/401(K) PLAN must return their
        instruction form so that it is received by Vanguard PRIOR TO 4:00 P.M.
        EASTERN TIME ON MONDAY, JULY 21, 2003. However, participants may also
        fax their instruction form to Vanguard at 1-877-226-7171 PRIOR TO 4:00
        P.M. EASTERN TIME ON MONDAY, JULY 21, 2003.

        REGISTERED HOLDERS AND ESPP PARTICIPANTS must return their proxy cards
        so that Mellon Investor Services (for the Gold proxy cards), or
        Georgeson Shareholder Communications (for the White proxy cards),
        receive the proxy card NO LATER THAN 5:00 P.M. EASTERN TIME ON THURSDAY,
        JULY 24, 2003 (one day prior to the meeting). Accordingly, we advise
        that registered holders mail their Gold proxy cards to Mellon Investor
        Services, or White proxy cards to Georgeson Shareholder Communications,
        by Friday, July 18, 2003

        BENEFICIAL OR STREET NAME HOLDERS must return their Gold or White Voting
        Instruction Form to ADP Proxy Services so that it is received NO LATER
        THAN 5:00 P.M. EASTERN TIME ON THURSDAY, JULY 24, 2003 (one day prior to
        the meeting). Accordingly, we advise that Voting Instruction Forms be
        mailed to ADP Proxy Services by Friday, July 18, 2003.

        Lastly, PARTICIPANTS IN THE FIBERVISIONS 401(K) PLAN must return their
        Gold or White proxy cards so that Mellon Investor Services receives the
        proxy card NO LATER THAN 5:00 P.M. EASTERN TIME ON WEDNESDAY, JULY 23.
        Accordingly, we advise that participants in this plan mail their proxy
        cards to Mellon by Thursday, July 17, 2003.

     o  VOTING SHARES AT THE ANNUAL MEETING

        Only REGISTERED HOLDERS AND PARTICIPANTS IN THE ESPP can validly vote
        their proxy cards at the Annual Meeting.

        PARTICIPANTS IN THE HERCULES SAVINGS/401(K) PLAN AND THE FIBERVISIONS
        401(K) PLAN are not permitted to vote their plan shares at the Annual
        Meeting.

        HOLDERS IN STREET NAME may vote their shares at the Annual Meeting if
        they receive a legal proxy from the bank or broker through which they
        hold their shares. Any street name holder who wishes to obtain a legal
        proxy prior to the Annual Meeting should contact MacKenzie Partners,
        Hercules' proxy solicitor, at (800) 322-2885, or the opponent's proxy
        solicitor, Georgeson Shareholder Communications, at (866) 288-2190, for
        assistance.