The commissioner shall make and adopt rules and regulations for the direction, control, discipline and conduct of the members of said department, for promotion on the basis of seniority of service, qualifications being equal, of the officers of the department, for the filing and hearing of charges against such officers and he may make any other rules and regulations for the governing and operation of said department as shall appear to him reasonably necessary to carry out the purposes of this act. He may require any officer or employe, who may receive and/or disburse public funds in the course of his duties, to file a bond conditioned that he will honestly, correctly, and according to law receive, disburse, pay over and/or account for all public moneys coming into his hands, such bond to be approved as to form, amount and surety by the attorney general.