The state treasurer, whenever any bonds or securities shall have been purchased by the board of curators for the seminary fund and payment therefor and delivery thereof have been made, shall plainly stamp on the face of each of said bonds or securities these words: “This bond is the property of the seminary fund”, and shall sign such statement, and thereafter no bond or securities so stamped shall be negotiable, but it or they shall only be payable to the state treasurer as trustee of the seminary fund. The interest on all such bonds or securities, when due, shall be collected by the state treasurer and credited to the “State Seminary Moneys Fund”, which is hereby created, and the payment of such interest certified by him to the board of curators.