§ 351. Salary of confidential court attendants of the supreme court justices in the third judicial district residing in Albany and Rensselaer counties. The confidential court attendants appointed by the justices of the supreme court in the third judicial district residing in Albany and Rensselaer counties, pursuant to section one hundred sixty-four of this chapter, shall each receive an annual salary not in excess of five thousand dollars, which shall be a charge upon the counties of Albany and Rensselaer, respectively, and shall be paid by the treasurer of each such county, respectively, upon certificate of such justice in monthly installments.