All appropriations hereafter made to educational, penal, reformatory, charitable, benevolent, or eleemosynary institutions shall be paid on the warrant of the Auditor General on a settlement made by him and the State Treasurer, but no warrant shall be drawn on settlement made until the directors or managers of such institutions shall have made, under oath, to the Auditor General a report, accompanied by the vouchers, containing a specifically itemized statement of the receipts from all sources and the expenses of the institution during the previous quarter, together with the cash balance on hand, and the same is approved by him and the State Treasurer, nor until the Treasurer shall have sufficient money in the Treasury, not otherwise appropriated, to pay the quarterly instalments due the institution; and unexpended balances of sums appropriated for specific purposes shall not be used for other purposes, whether specific or general, and shall revert to the State Treasury at the close of the fiscal period for which it was made.