NOTICE

     THE PURPOSE OF THIS POWER OF ATTORNEY IS TO GIVE THE PERSONS YOU  DESIGNATE
(YOUR "AGENTS") BROAD POWERS TO ACT ON YOUR BEHALF WITH THE U.S.  SECURITIES AND
EXCHANGE COMMISSION (THE "COMMISSION"),  WHICH MAY INCLUDE,  BUT ARE NOT LIMITED
TO, POWERS TO FILE A REGISTRATION  STATEMENT,  TO FILE ANY AND ALL  APPLICATIONS
FOR EXEMPTIVE RELIEF FROM STATE OR FEDERAL  REGULATIONS,  AND TO PERFORM ANY AND
ALL ACTS THE AGENTS DEEM NECESSARY TO ENABLE THE  UNDERSIGNED  PERSONS TO COMPLY
WITH THE APPLICABLE  LAWS OF THE UNITED STATES WITHOUT  ADVANCE NOTICE TO YOU OR
APPROVAL BY YOU.

     THIS POWER OF  ATTORNEY  DOES NOT IMPOSE A DUTY ON YOUR  AGENTS TO EXERCISE
GRANTED POWERS, BUT WHEN POWERS ARE EXERCISED,  YOUR AGENTS MUST USE DUE CARE TO
ACT FOR YOUR BENEFIT AND IN ACCORDANCE WITH THIS POWER OF ATTORNEY.

     YOUR AGENTS MAY EXERCISE THE POWERS GIVEN HERE  THROUGHOUT  YOUR  LIFETIME,
EVEN AFTER YOU BECOME INCAPACITATED,  UNLESS YOU EXPRESSLY LIMIT THE DURATION OF
THESE  POWERS  OR YOU  REVOKE  THESE  POWERS OR A COURT  ACTING  ON YOUR  BEHALF
TERMINATES YOUR AGENTS' AUTHORITY.

     YOUR AGENTS MUST KEEP YOUR FUNDS SEPARATE FROM YOUR AGENTS' FUNDS.

         A COURT CAN TAKE AWAY THE POWERS OF YOUR AGENTS IF IT FINDS YOUR AGENTS
ARE NOT ACTING PROPERLY.

     THE POWERS AND DUTIES OF AN AGENT UNDER A POWER OF ATTORNEY  ARE  EXPLAINED
MORE FULLY IN 20 PA.C.S. CH. 56.

     IF THERE IS ANYTHING ABOUT THIS FORM THAT YOU DO NOT UNDERSTAND, YOU SHOULD
ASK A LAWYER OF YOUR OWN CHOOSING TO EXPLAIN IT TO YOU.







     I HAVE  READ  OR HAD  EXPLAINED  TO ME THIS  NOTICE  AND I  UNDERSTAND  ITS
CONTENTS.



                                                                             

                NAME                                TITLE                                DATE

/S/ JOHN J. BRENNAN                                                               JULY 20, 2007
- --------------------------            Chairman, Chief Executive              ---------------------------
John J. Brennan                       Officer, and Trustee                        July 20, 2007


/S/ THOMAS J. HIGGINS                                                             JULY 20, 2007
- --------------------------            Treasurer (Principal Financial         ---------------------------
Thomas J. Higgins                     and Accounting Officer)                     July 20, 2007


/S/ CHARLES D. ELLIS                                                              JULY 20, 2007
- --------------------------                                                   ---------------------------
Charles D. Ellis                      Trustee                                     July 20, 2007


/S/ RAJIV L. GUPTA                                                                JULY 20, 2007
- --------------------------                                                   ---------------------------
Rajiv L. Gupta                        Trustee                                     July 20, 2007


/S/ AMY GUTMANN                                                                   JULY 20, 2007
- --------------------------                                                   ---------------------------
Amy Gutmann                           Trustee                                     July 20, 2007


/S/ JOANN HEFFERNAN HEISEN                                                        JULY 20, 2007
- --------------------------                                                   ---------------------------
JoAnn Heffernan Heisen                Trustee                                     July 20, 2007


/S/ ANDRE F. PEROLD                                                               JULY 20, 2007
- --------------------------                                                   ---------------------------
Andre F. Perold                       Trustee                                     July 20, 2007


/S/ ALFRED M. RANKIN, JR.                                                         JULY 20, 2007
- --------------------------                                                   ---------------------------
Alfred M. Rankin, Jr.                 Trustee                                     July 20, 2007


/S/ J. LAWRENCE WILSON                                                            JULY 20, 2007
- --------------------------                                                   ---------------------------
J. Lawrence Wilson                    Trustee                                     July 20, 2007



The above-listed Directors/Trustees sit on the Board for each Registrant.



                                                                               2







                                                        

Vanguard Wellington Fund                                Vanguard New York Tax-Free Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee

Vanguard Windsor Funds                                  Vanguard Pennsylvania Tax-Free Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee

Vanguard World Funds                                    Vanguard New Jersey Tax-Free Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee

Vanguard Explorer Fund                                  Vanguard Ohio Tax-Free Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee

Vanguard Morgan Growth Fund                             Vanguard Convertible Securities Fund


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee

Vanguard Wellesley Income Fund                          Vanguard Quantitative Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee





                                                                               3








                                                         

Vanguard Fixed Income Securities Funds                  Vanguard Fenway Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee

Vanguard Money Market Funds                             Vanguard Malvern Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee

Vanguard International Equity Index Funds               Vanguard Index Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee

Vanguard Variable Insurance Fund                        Vanguard Municipal Bond Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee

Vanguard STAR Fund                                      Vanguard Trustees Equity Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee

Vanguard Whitehall Funds                                Vanguard CMT Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee

                                                                               4








                                                        

Vanguard Specialized Funds                              Vanguard Tax-Managed Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee

Vanguard Chester Funds                                  Vanguard Treasury Fund


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee
Vanguard Florida Tax-Free Funds                         Vanguard Horizon Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee

Vanguard California Tax-Free Funds                      Vanguard Institutional Index Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee

Vanguard Balanced Index Fund                            Vanguard Bond Index Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee

Vanguard Massachusetts Tax-Exempt Funds                 Vanguard Admiral Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee

Vanguard Montgomery Funds


By     /S/ JOHN J. BRENNAN
       --------------------
Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and
       Trustee




                                                                               5








                                POWER OF ATTORNEY

     Each  person  (as such term is defined in the  Securities  Act of 1933,  as
amended) whose signature appears below (the "Principals") hereby constitutes and
appoints Heidi Stam and Arthur Gabinet and each of them,  with full power to act
without the other, as the true and lawful  attorney-in-fact and agent, with full
and several power of substitution,  of such undersigned person with authority to
take any  appropriate  action  to  execute  in the name of and on behalf of such
undersigned  person,  and to file with the  Commission,  any and all  amendments
(including  without  limitation  post-effective  amendments)  to a  registration
statement,  any and all  applications for exemptive relief from state or federal
regulations,  and  any  and  all  amendments  thereto,  or any  other  forms  of
documents,  including  without  limitation,  any registration  statement on Form
N-14, and any and all amendments  thereto,  and to perform any and all such acts
as such attorney-in-fact may deem necessary or advisable to enable the following
named persons that are registered  with the Commission  (the  "Registrants")  to
comply with the applicable  laws of the United States,  any individual  state or
similar  jurisdiction  of the United  States,  and in  connection  therewith  to
execute and file all requisite  papers and documents,  including but not limited
to,  applications,  reports,  notices,  surety bonds,  irrevocable  consents and
appointments   of   attorneys   for  service  of   process;   granting  to  such
attorneys-in-fact  and agents,  and each of them, full power and authority to do
and perform each and every act  requisite and necessary to be done in connection
therewith,  as fully as the relevant  Registrant and undersigned person might or
could  do  herself,  himself  or  itself  or in  person,  hereby  ratifying  and
confirming all that such  attorneys-in-fact  and agents or any of them, or their
substitute or substitutes, may lawfully do or cause to be done by virtue hereof:




                                             

Vanguard Wellington Fund (2-11444)                      Vanguard New York Tax-Free Funds (33-2908)
Vanguard Windsor Funds (2-14336)                        Vanguard Pennsylvania Tax-Free Funds (33-2907)
Vanguard World Funds (2-17620)                          Vanguard New Jersey Tax-Free Funds  (33-17351)
Vanguard Explorer Fund (2-27203)                        Vanguard Ohio Tax-Free Funds (33-34261)
Vanguard Morgan Growth Fund (2-29601)                   Vanguard Convertible Securities Fund (33-4424)
Vanguard Wellesley Income Fund (2-31333)                Vanguard Quantitative Funds (33-8553)
Vanguard Fixed Income Securities Funds (2-47371)        Vanguard Fenway Funds (33-19446)
Vanguard Money Market Funds (2-52698)                   Vanguard Malvern Funds (33-23444)
Vanguard Index Funds (2-56846)                          Vanguard International Equity Index Funds (33-32548)
Vanguard Municipal Bond Funds (2-57689)                 Vanguard Variable Insurance Fund (33-32216)
Vanguard Trustees Equity Funds (2-65955-99)             Vanguard STAR Fund (2-88373)
Vanguard Specialized Funds (2-88116)                    Vanguard Whitehall Funds (33-64845)
Vanguard Chester Funds (2-92948)                        Vanguard Tax-Managed Funds (33-53683)
Vanguard Florida Tax-Free Funds (33-48783)              Vanguard Treasury Fund (333-11763)
Vanguard California Tax-Free Funds (33-1569)            Vanguard Horizon Funds (33-56443)
Vanguard Massachusetts Tax-Exempt Funds (333-63579)     Vanguard Institutional Index Funds (33-34494)
Vanguard Balanced Index Fund (33-48863)                 Vanguard Admiral Funds (33-49023)
Vanguard CMT Funds (333-111362)                         Vanguard Bond Index Funds (33-6001)
Vanguard Montgomery Funds



         The Principals hereby revoke all powers of attorney which they may have
heretofore granted regarding the subject matter hereof.
                                                                               6







         Each of the undersigned persons has executed this Power of Attorney in
the capacity and on the date indicated opposite the name of the undersigned
person.



                                                                             

                NAME                                TITLE                                DATE

/S/ JOHN J. BRENNAN                                                               JULY 20,2007
- --------------------------            Chairman, Chief Executive              ---------------------------
John J. Brennan                       Officer, and Trustee                        July 20,2007


/S/ THOMAS J. HIGGINS                                                             JULY 20,2007
- --------------------------            Treasurer (Principal Financial         ---------------------------
Thomas J. Higgins                     and Accounting Officer)                     July 20,2007


/S/ CHARLES D. ELLIS                                                              JULY 20,2007
- --------------------------                                                   ---------------------------
Charles D. Ellis                      Trustee                                     July 20,2007


/S/ RAJIV L. GUPTA                                                                JULY 20,2007
- --------------------------                                                   ---------------------------
Rajiv L. Gupta                        Trustee                                     July 20,2007


/S/ AMY GUTMANN                                                                   JULY 20,2007
- --------------------------                                                   ---------------------------
Amy Gutmann                           Trustee                                     July 20,2007


/S/ JOANN HEFFERNAN HEISEN                                                        JULY 20,2007
- --------------------------                                                   ---------------------------
JoAnn Heffernan Heisen                Trustee                                     July 20,2007


/S/ ANDRE F. PEROLD                                                               JULY 20,2007
- --------------------------                                                   ---------------------------
Andre F. Perold                       Trustee                                     July 20,2007


/S/ ALFRED M. RANKIN, JR.                                                         JULY 20,2007
- --------------------------                                                   ---------------------------
Alfred M. Rankin, Jr.                 Trustee                                     July 20,2007


/S/ J. LAWRENCE WILSON                                                            JULY 20,2007
- --------------------------                                                   ---------------------------
J. Lawrence Wilson                    Trustee                                     July 20,2007


The above-listed Directors/Trustees sit on the Board for each Registrant.

                                                                               7







                                                      

Vanguard Wellington Fund                                Vanguard New York Tax-Free Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title:    Chairman, Chief Executive Officer, and        Title:    Chairman, Chief Executive Officer, and
             Trustee                                                 Trustee

Vanguard Windsor Funds                                  Vanguard Pennsylvania Tax-Free Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title:    Chairman, Chief Executive Officer, and        Title:    Chairman, Chief Executive Officer, and
             Trustee                                                 Trustee

Vanguard World Funds                                    Vanguard New Jersey Tax-Free Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title:    Chairman, Chief Executive Officer, and        Title:    Chairman, Chief Executive Officer, and
             Trustee                                                 Trustee

Vanguard Explorer Fund                                  Vanguard Ohio Tax-Free Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:   John J. Brennan                                 Name:  John J. Brennan
Title:    Chairman, Chief Executive Officer, and        Title:    Chairman, Chief Executive Officer, and
             Trustee                                                 Trustee

Vanguard Morgan Growth Fund                             Vanguard Convertible Securities Fund


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title:    Chairman, Chief Executive Officer, and        Title:    Chairman, Chief Executive Officer, and
             Trustee                                                 Trustee

Vanguard Wellesley Income Fund                          Vanguard Quantitative Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title:    Chairman, Chief Executive Officer, and        Title:    Chairman, Chief Executive Officer, and
             Trustee                                                 Trustee


                                                                               8









                                                      
Vanguard Fixed Income Securities Funds                  Vanguard Fenway Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title:    Chairman, Chief Executive Officer, and        Title:    Chairman, Chief Executive Officer, and
             Trustee                                                 Trustee

Vanguard Money Market Funds                             Vanguard Malvern Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title:    Chairman, Chief Executive Officer, and        Title:    Chairman, Chief Executive Officer, and
             Trustee                                                 Trustee

Vanguard International Equity Index Funds               Vanguard Index Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title:    Chairman, Chief Executive Officer, and        Title:    Chairman, Chief Executive Officer, and
             Trustee                                                 Trustee

Vanguard Variable Insurance Fund                        Vanguard Municipal Bond Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title:    Chairman, Chief Executive Officer, and        Title:    Chairman, Chief Executive Officer, and
             Trustee                                                 Trustee

Vanguard STAR Fund                                      Vanguard Trustees Equity Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title:    Chairman, Chief Executive Officer, and        Title:    Chairman, Chief Executive Officer, and
             Trustee                                                 Trustee

Vanguard Whitehall Funds                                Vanguard CMT Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title:    Chairman, Chief Executive Officer, and        Title:    Chairman, Chief Executive Officer, and
             Trustee                                                 Trustee

                                                                               9









                                                        

Vanguard Specialized Funds                              Vanguard Tax-Managed Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee

Vanguard Chester Funds                                  Vanguard Treasury Fund


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee
Vanguard Florida Tax-Free Funds                         Vanguard Horizon Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee

Vanguard California Tax-Free Funds                      Vanguard Institutional Index Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee

Vanguard Balanced Index Fund                            Vanguard Bond Index Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee

Vanguard Massachusetts Tax-Exempt Funds                 Vanguard Admiral Funds


By     /S/ JOHN J. BRENNAN                              By     /S/ JOHN J. BRENNAN
       --------------------                                    --------------------
Name:  John J. Brennan                                  Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and           Title: Chairman, Chief Executive Officer, and
       Trustee                                                 Trustee


Vanguard Montgomery Funds


By     /S/ JOHN J. BRENNAN
       --------------------
Name:  John J. Brennan
Title: Chairman, Chief Executive Officer, and
       Trustee


                                                                              10








                                 ACKNOWLEDGMENT

     We, Heidi Stam and Arthur Gabinet, have read the attached power of attorney
and are the  persons  identified  as the agents for the  Registrants.  We hereby
acknowledge  that in the absence of a specific  provision to the contrary in the
power of attorney or in 20 Pa.C.S. when we act as agents:

         We shall exercise the powers for the benefit of the Registrants.

         We shall keep the assets of the Registrants separate from our assets.

         We shall exercise reasonable caution and prudence.

         We shall keep a full and accurate record of all actions, receipts, and
disbursements on behalf of the Registrants.


Date:  JULY 20, 2007
       -------------------


                                                    /S/ HEIDI STAM
                                                 ------------------------------
                                                                     Heidi Stam


                                                    /S/ ARTHUR GABINET
                                                 ------------------------------
                                                                 Arthur Gabinet






- --------------------------------------------------------------------------------
                               PROPOSED RESOLUTION

                         APPROVAL OF A POWER OF ATTORNEY
- --------------------------------------------------------------------------------



     RESOLVED,  that the proposed Power of Attorney,  in substantially  the form
presented to this meeting,  constituting  and  appointing  Heidi Stam and Arthur
Gabinet each with full power to act alone) as  attorneys-in-fact  and agents for
(i) each of the Directors,  Trustees,  principal executive officer and principal
financial and accounting officer of the investment  companies that are listed in
the proposed Power of Attorney (each of such investment  companies,  a "Vanguard
Company"); and (ii) each of the Vanguard Companies, for the purpose of executing
and filing for and on behalf of the Vanguard  Companies all requisite papers and
documents with the U.S.  Securities  and Exchange  Commission and the offices of
the securities  administrators  of the states and similar  jurisdictions  of the
United  States to comply  with the  applicable  laws of the United  States,  any
individual  state or  similar  jurisdiction  of the  United  States,  is  hereby
approved and may be executed by each  designated  Director/Trustee,  officer and
Vanguard Company.