There is hereby created a board of trustees, who shall serve without pay or personal expenses, to administer the Alabama Stonewall Jackson Memorial Fund. The trustees shall be the Alabama State Superintendent of Education, the Director of the Alabama Department of Archives and History and the President of the Stonewall Jackson Memorial, Incorporated. This board of trustees shall be vested with the power to administer this chapter in its entirety and to prescribe the rules and regulations governing the essay contests and the awarding of scholarships from the Alabama Stonewall Jackson Memorial Fund. It is hereby directed to receive the appropriation hereinafter made, to designate a bank in Alabama as a depository for the fund and is further directed to invest said fund in such sound securities as it deems advisable in line with good business procedure; and it is expressly prohibited from spending any part of the principal of this fund, it being the intent of this chapter that only the income from said fund shall be used in carrying out the purposes of the chapter. The board of trustees shall require, insofar as possible, the repayment of all scholarship funds by the recipients thereof, under such terms as circumstances may justify, and any money so repaid shall become part of the principal of the fund.