For the payment of the principal of and interest on the bonds issued under Sections 65-4-25 through 65-4-45, the full faith, credit, and taxing power of the State of Mississippi are hereby irrevocably pledged. If the funds appropriated by the Legislature be insufficient to pay the principal of and interest on the bonds as they become due, then the deficiency shall be paid by the State Treasurer from any funds in the State Treasury not otherwise appropriated. All such bonds shall contain recitals on their faces substantially covering the foregoing provisions of this section.