110 ILCS 310/7

The treasurer of the said University, and the said board, are hereby required in the future to invest the principal of the funds arising from the endowment granted by the United States, in interest-bearing bonds of the United States, or of this State, or in good county or school district bonds of this State. They are hereby prohibited from changing the securities in which said fund may be invested, except for reinvestment in interest-bearing bonds of the class and character specified above in this section.