LETTER AGREEMENT

Exhibit (d) 3.19

LETTER AGREEMENT

State Street Bank and Trust Company

P.O. Box 1713

Boston, MA 02105

Re: Yield Calculation Services Agreement

Pursuant to Section 9 of the Amended and Restated Yield Calculation Services Agreement of Xxxxxxx Investment Company (“RIC”), dated August 1, 2006, RIC advises you that it is creating Class Y Shares for the existing Real Estate Securities, Emerging Markets, Short Duration Bond, Global Equity and Money Market Funds (the “New Class”). RIC desires for State Street Bank and Trust Company to compute the performance results of the New Class pursuant to the terms and conditions of the Amended and Restated Yield Calculation Service Agreement. The fees to be charged by you in return for your services are set forth in the Amended and Restated Yield Calculation Services Agreement.

Please indicate your acceptance to amend the Amended and Restated Yield Calculation Service Agreement by executing this letter agreement and returning it to the undersigned.

Sincerely,

XXXXXXX INVESTMENT COMPANY

By:

Xxxx X. Xxxxxxx

Treasurer

Accepted this              day of                                         , 2008

STATE STREET BANK AND TRUST COMPANY

By:

Its: