Section 2. That the fifth section of said act of May ninth, one thousand eight hundred and seventy-nine, shall be and the same is hereby repealed; and, in lieu thereof, the councils of cities of the second class, issuing bonds under authority of the said act, at each time of levying the municipal taxes and making the annual appropriations, until all of the said improvement bonds are retired and cancelled, shall provide for, set apart and appropriate, from the general revenues of such city, a sum sufficient to pay the interest on the said bonds during the fiscal year they next ensuing; and the said councils shall, at the same time, provide, set apart, and appropriate, out of the general revenues of such city, a further sum sufficient to create a sinking fund, equal in amount to three and one third per centum of the total amount of said bonds then issued, which sum so appropriated shall be used for the retirement and cancellation of said bonds, and for no other purpose.