In the bylaws and regulations provided for by section 759.11 of the Revised Code, the director of public service shall declare the amount of money he will accept by agreement, gift, devise, bequest, or otherwise and hold as a permanent fund of the cemetery. He shall pledge the faith and credit of the city for the perpetual care of the lots designated, using only the interest or income of the money. On receipt of the sum of money so designated, the director shall issue therefor a written receipt and acknowledgment thereof, signed by him, binding the faith and credit of the city to forever hold such money as a permanent fund and to provide perpetual care of the lots therein named, for the use, income, or interest of such money. He shall enter on the minutes of his proceedings full detail of the obligation, and shall enter the receipt and income of the money and the expenditure thereof in detail on his books of accounts, keeping each case separately.