Mo. Rev. Stat. § 166.011

A state public school fund is created which shall consist of all moneys, bonds, lands and other properties belonging to or donated to any state fund for public school purposes and the net proceeds of all sales of lands and other property and effects that accrue to the state by escheat. All such funds shall be paid into the state treasury and securely invested by the state board of education, and sacredly preserved as a public school fund, the annual income of which shall be faithfully appropriated for establishing and maintaining free public schools and for no other uses or purposes whatsoever.