§ 235. The board of supervisors by resolution may appoint a committee of citizens of the county to act in an advisory capacity to any committee, department or office on any subject relating to county government. The members of such committee shall serve without compensation and it shall be the duty of such advisory committee to meet, consult and advise with the officers or department heads named in the resolution. Such advisory committee shall have no powers other than advisory. The board of supervisors may authorize the payment of the just and reasonable actual expenses of the members of such advisory committee.