All monies actually in the treasury to the credit of the fund from which they are to be drawn, and all monies applicable to the payment of the obligation or appropriation involved, that are anticipated to come into the treasury before the maturity of such contract, agreement, or obligation, from taxes, assessments, or license fees, or from sales of services, products, or by- products of any City undertaking, and monies to be derived from lawfully authorized notes or bonds sold and in process of delivery shall, for the purpose of such certificate, be deemed to be in the treasury to the credit of the appropriate fund, and shall be subject to such certification.