Section 72. Pensions and annuities granted under the three preceding sections and any expenses connected therewith shall, except as hereinafter provided, be paid out of the appropriations for the Metropolitan Parks Maintenance Fund; provided, that such pensions, annuities and expenses shall not be paid out of any general appropriations made for the maintenance of reservations or boulevards under the care and control of said commission, but shall be provided for by specific appropriations for the purpose. Pensions or annuities paid on account of disability or death of officers assigned to duty under the colonel of state police shall be paid out of the ordinary revenue of the commonwealth.