Section 26. It shall be the duty of the commissioners of the district of Southwark, and the commissioners of the township of Moyamensing, hereafter, annually, to cause to be levied upon the property and persons made taxable by law, within the said district and township, a sum sufficient with the other revenues, to pay all the annual expenditures of said district or township, the interest on all loans made for the use of the said district or township, and a sum sufficient to form the sinking funds hereinbefore created.