SCHEDULE 14A INFORMATION

           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

___ Definitive proxy statement

X   Definitive additional materials

___ Confidential, for use of the Commission only (as permitted by
Rule 14c-5(d)(2))

___ Soliciting Materials under Rule 14a-12

                          Principal Growth Fund, Inc.
                (Name of Registrant as Specified in Its Charter)

Payment of Filing Fee (Check the appropriate box):

X   No fee required.

___ Fee computed on table below per Exchange Act Rules 14A-6(I)(1)

    not applicable)

___ 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.

    (not applicable)



- --------------------------------------------------------------------------------
eFP Article
- --------------------------------------------------------------------------------
For posting May 17 (advance copy to be sent to Princor wholesalers/salesdesk
May 16)

Urgent Message: Principal Mutual Funds Shareholder Votes Needed

Voting is underway regarding the proposal to combine Principal Mutual Funds into
the existing Principal Investors Fund, Inc. We need your help to ensure your
clients cast their votes.

The proxy solicitation firm is in the process of contacting shareholders who
have not voted their shares. Each effort to contact these shareholders results
in additional costs. The costs are borne by the funds and Principal Management
Corporation, which manages the funds. Making multiple contacts to individual
shareholders - or failing to achieve a successful vote - could lead to higher
expenses.

Several weeks ago, you received a pre-approved call script [link to call script]
and letter [link to letter] regarding the proposal to combine Principal Mutual
Funds into the existing Principal Investors Fund. Copies of these resources are
attached. It's imperative that you contact your clients and encourage them to
vote.

Voting is easy and only takes a few minutes. Urge your clients to vote as soon
as possible by returning the proxy ballot they received in the mail, visiting
the Internet address provided on the proxy materials, or calling toll-free
888-999-5346. They should refer to the proxy materials received in the mail for
further instructions. If they have misplaced their proxy materials, they can
obtain another set by also calling 888-999-5346.

      For registered representative use only. Not for use with the public.

#374352007

- --------------------------------------------------------------------------------
Inside The Principal article
- --------------------------------------------------------------------------------
For posting May 17

Urgent Message: Principal Mutual Funds Shareholder Votes Needed

Voting is underway regarding the proposal to combine Principal Mutual Funds into
the existing Principal Investors Fund, Inc. We need your help. If you own shares
of any of the Principal Mutual Funds please make sure you cast your vote.

The proxy solicitation firm is in the process of contacting shareholders who
have not voted their shares. Each effort to contact these shareholders results
in additional costs. The costs are borne by the funds and Principal Management
Corporation, which manages the funds. Making multiple contacts to individual
shareholders - or failing to achieve a successful vote - could lead to higher
expenses.

Voting is easy and only takes a few minutes. Please vote as soon as possible by
returning the proxy ballot you received in the mail, visiting the Internet
address provided on the proxy materials, or calling toll-free 888-999-5346. If
you have misplaced your proxy and voting ballot, you can call 888-999-5346 for
assistance.

Time is of the essence. The shareholder meeting is less than thirty days away
and we need your vote today.

Important note: Many employees of The Principal recently received a proxy
mailing and subsequently voted their shares of Principal Financial Group common
stock. These issues are not the same and a second and separate vote of your
Principal Mutual Funds shares is being requested here. If you are in doubt as to
whether or not you have voted your Principal Mutual Fund shares or no longer
have your proxy information, please call 888-999-5346.

Insurance products and plan administrative services are provided by Principal
Life Insurance Company. Securities are offered through Princor Financial
Services Corporation, 800-247-4123, member SIPC. Princor and Principal Life are
members of the Principal Financial Group, Des Moines, IA 50392.

Before investing in mutual funds, investors should carefully consider the
investment objectives, risks, charges and expenses of the funds. This and other
information is contained in the free prospectus, which can be obtained from your
local representative. Please read the prospectus carefully before investing.

#374452007



(Second Mailing Letter for Registered Customers)

                             PRINCIPAL MUTUAL FUNDS
                                 680 8TH STREET
                          DES MOINES, IOWA 50392-2080


                              Important Proxy News
                               ------------------
                        Special Meeting of Shareholders
                                on June 16, 2005
                        -------------------------------


Dear Shareholder:

Recently,  we  distributed  proxy  material  regarding  the  Special  Meeting of
Shareholders of the Principal  Mutual Funds.  This meeting is scheduled for June
16,  2005  at 2:00  p.m.  Central  Daylight  Time at the  offices  of  Principal
Management Corporation, 680-8th Street, Des Moines, Iowa 50392-2080. Our records
indicate that we have not yet received your voting instructions.

                        YOUR VOTE IS NEEDED IMMEDIATELY!

You are begin asked to approve an  Agreement  and Plan of  Reorganization.  Your
Fund's  Board of  Directors  has  approved the proposal as detailed in the Proxy
statement/Prospectus  and recommends  that you vote "FOR" the proposal.  We urge
you to act promptly in order to allow us to obtain a sufficient number of votes,
avoid  the cost of  additional  solicitation  and the  possibility  of a meeting
adjournment.  Your vote is important no matter how many shares you own. In order
for your vote to be represented,  we must receive your instructions on or before
Wednesday, June 15, 2005.

For your  convenience,  please utilize one of the easy methods below to register
your vote:

1.   By Phone.

     Please call toll-free at  1.888.999.5346  Representatives  are available to
     take your vote Monday  through  Friday  between the hours of 9:00 a.m.  and
     11:00 p.m. and Saturday from 12:00 p.m. to 6:00 p.m. Eastern Time.

2.   By Internet.

     Visit  www.proxyweb.com  and enter the 12-digit  control  number located on
     your proxy card.

3.   By Touch-tone Phone.

     Dial the  toll-free  number  found on your proxy card and follow the simple
     instructions.

While you may return your executed proxy in the enclosed  postage paid envelope,
please  try to  utilize  one of the  options  above to ensure  that your vote is
received in time for the Meeting.

                     WE NEED YOUR HELP! PLEASE VOTE TODAY!



(Second Mailing Letter for OBO)

                             PRINCIPAL MUTUAL FUNDS
                                 680 8TH STREET
                          DES MOINES, IOWA 50392-2080


                              Important Proxy News
                               ------------------
                        Special Meeting of Shareholders
                                on June 16, 2005
                        -------------------------------


Dear Shareholder:

Recently,  we  distributed  proxy  material  regarding  the  Special  Meeting of
Shareholders of the Principal  Mutual Funds.  This meeting is scheduled for June
16,  2005  at 2:00  p.m.  Central  Daylight  Time at the  offices  of  Principal
Management Corporation, 680-8th Street, Des Moines, Iowa 50392-2080. Our records
indicate that we have not yet received your voting instructions.

                        YOUR VOTE IS NEEDED IMMEDIATELY!

You are begin asked to approve an  Agreement  and Plan of  Reorganization.  Your
Fund's  Board of  Directors  has  approved the proposal as detailed in the Proxy
statement/Prospectus  and recommends  that you vote "FOR" the proposal.  We urge
you to act promptly in order to allow us to obtain a sufficient number of votes,
avoid  the cost of  additional  solicitation  and the  possibility  of a meeting
adjournment.  Your vote is important no matter how many shares you own. In order
for your vote to be represented,  we must receive your instructions on or before
Wednesday, June 15, 2005.

For your  convenience,  please utilize one of the easy methods below to register
your vote:

1.   By Touch-tone Phone.

     Dial the  toll-free  number  found on your proxy card and follow the simple
     instructions.

2.   By Internet.

     Visit  www.proxyvote.com  and enter the control  number located on
     your proxy card.

For Assistance:

Please call toll-free at 1.888.999.5346 Representatives are available to answer
questions Monday through Friday between the hours of 9:00 a.m. and 11:0 p.m. and
Saturday from 12:00 p.m. to 6:00 p.m. Eastern Time.

While you may return your executed proxy in the enclosed  postage paid envelope,
please  try to  utilize  one of the  options  above to ensure  that your vote is
received in time for the Meeting.

                     WE NEED YOUR HELP! PLEASE VOTE TODAY!


(Second Mailing Letter for NOBO)

                             PRINCIPAL MUTUAL FUNDS
                                 680 8TH STREET
                          DES MOINES, IOWA 50392-2080


                              Important Proxy News
                               ------------------
                        Special Meeting of Shareholders
                                on June 16, 2005
                        -------------------------------


Dear Shareholder:

Recently,  we  distributed  proxy  material  regarding  the  Special  Meeting of
Shareholders of the Principal  Mutual Funds.  This meeting is scheduled for June
16,  2005  at 2:00  p.m.  Central  Daylight  Time at the  offices  of  Principal
Management Corporation, 680-8th Street, Des Moines, Iowa 50392-2080. Our records
indicate that we have not yet received your voting instructions.

                        YOUR VOTE IS NEEDED IMMEDIATELY!

You are begin asked to approve an  Agreement  and Plan of  Reorganization.  Your
Fund's  Board of  Directors  has  approved the proposal as detailed in the Proxy
statement/Prospectus  and recommends  that you vote "FOR" the proposal.  We urge
you to act promptly in order to allow us to obtain a sufficient number of votes,
avoid  the cost of  additional  solicitation  and the  possibility  of a meeting
adjournment.  Your vote is important no matter how many shares you own. In order
for your vote to be represented,  we must receive your instructions on or before
Wednesday, June 15, 2005.

For your  convenience,  please utilize one of the easy methods below to register
your vote:

1.   By Phone.

     Please call toll-free at  1.888.999.5346  Representatives  are available to
     take your vote Monday  through  Friday  between the hours of 9:00 a.m.  and
     11:00 p.m. and Saturday from 12:00 p.m. to 6:00 p.m. Eastern Time.

2.   By Internet.

     Visit  www.proxyvote.com and enter the 12-digit  control  number located on
     your proxy card.

3.   By Touch-tone Phone.

     Dial the  toll-free  number  found on your proxy card and follow the simple
     instructions.

While you may return your executed proxy in the enclosed  postage paid envelope,
please  try to  utilize  one of the  options  above to ensure  that your vote is
received in time for the Meeting.

                     WE NEED YOUR HELP! PLEASE VOTE TODAY!