The board of commissioners may pay, out of the county funds not otherwise appropriated, a sum of money not exceeding four thousand dollars ($4000) annually to the county historical society, to assist in paying the running expenses thereof. If there is more than one such society in the county, such payment may be made only to the oldest society. Where any such society is comprised of residents of more than one county, the commissioners of said respective counties may jointly pay said sum in such proportion as they shall agree.
No such appropriation shall be renewed until vouchers have been filed with the commissioners showing that the appropriation for any prior year has been expended for the purpose herein designated.
16 P.S. § 5129