Sec. 6. PROCEDURE WHERE REFUNDING BONDS ARE VOTED DOWN. In cases where changes are made in districts having outstanding bonded indebtedness and where the necessary refunding bonds are voted down or where the County Board of Education is otherwise unable to arrange an adjustment or settlement of such bonded indebtedness, it shall be the duty of the trustee to certify the fact and the territories affected by such changes, to the Commissioners' Court and thereupon it shall become the duty of the Commissioners' Court to thereafter annually levy and cause to be assessed and collected from the taxpayers of such districts as existed before the changes were made, and tax necessary to pay the interest, the sinking fund and discharge the principal of such indebtedness as it matures. And it shall be the duty of each Independent School District so affected, to cause all funds in its hands, whether sinking funds or otherwise, which have been collected on account of such bonded indebtedness, to be transferred to the County Treasurer of the county in which such district is situated and such district shall thereafter cease to levy and collect any tax on account of such bonds; and it shall be the duty of the County Treasurer to keep the funds so transferred and those arising from taxation, in separate accounts and apply the same only to the discharge of such bonded indebtedness and the interest thereon, as the same matures.