June 24, 1991 Mr. David King President John Hancock Fund Services P.O. Box 9114 Boston, MA 02199-9114 Subject: John Hancock World Fund -- John Hancock Global Rx Fund Dear Mr. King: Pursuant to Article 8.01 of the Transfer Agency and Service Agreement...

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                                                                     Exhibit 9a


                                  June 24, 1991


Mr. Xxxxx Xxxx
President
Xxxx Xxxxxxx Fund Services
X.X. Xxx 0000
Xxxxxx, XX  00000-0000

Subject:     Xxxx Xxxxxxx World Fund --
             Xxxx Xxxxxxx Global Rx Fund

Dear Xx. Xxxx:

Pursuant to Article 8.01 of the Transfer Agency and Service Agreement dated
January 1, 1991, between Xxxx Xxxxxxx World Fund (the "Trust") and Xxxx Xxxxxxx
Fund Service, Inc., the Trust hereby notifies you that it desires to have you
render services as transfer agent to the Xxxx Xxxxxxx Global Rx Fund, a new
series of the Trust, and that such series of shares become a Fund under the
Agreement.

If Xxxx Xxxxxxx Fund Services agrees to provide such services, please sign below
and return a signed copy to me.

Xxxx Xxxxxxx Fund Services, Inc.            Xxxx Xxxxxxx World Fund


By: /s/Xxxxx X. Xxxx                        By: /s/Xxxxxxx X. Xxxxx
   ------------------------                     ------------------------
    President                                   Assistant Secretary


Attest: /s/Xxxxxx Xxxxxxxxx                 Attest: /s/Xxxxx X. Xxxxxx
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