All license fees shall be paid in advance as hereafter provided to the secretary and treasurer of the Board and by him held as a fund for the use of the Board. The compensation and expenses of the members of the Board as herein provided, the salaries of its employees, and all expenses incurred in the discharge of its duties under this Article shall be paid out of such fund, upon the warrant of the chairman and secretary and treasurer: Provided, upon the payment of the necessary expenses of the Board as herein set out, and the retention by it of twenty-five per centum (25%) of the balance of funds collected hereunder the residue, if any, shall be paid to the State Treasurer. (1955, c. 912, s. 12.)