§ 345. County or part-county boards of health; compensation and expenses of members. The members of the board of health of a county or part-county health district shall receive for attendance at meetings of the board, and, when authorized by the president of the board, within appropriations made therefor, for meetings of standing committees, a per diem compensation which shall be fixed by the board of supervisors, and in addition thereto, they shall be allowed actual and necessary traveling expenses, to be audited and paid in the same manner as other expenses of such board of health.