84.360. The governor of the state of Missouri, by and withthe consent of the senate, shall appoint the four commissionersprovided for in section 84.350, and one commissioner shall beappointed for a term of one year; one commissioner shall beappointed for a term of two years; one commissioner shall beappointed for a term of three years; one commissioner shall beappointed for a term of four years. Their successors shall eachbe appointed for a term of four years, and said commissionersshall hold office for their term of appointment and until theirsuccessors shall have been appointed and qualified. In case of avacancy in said board from any cause whatever, it shall be filledby appointment for the unexpired term, in the same manner as inthe case of original appointments. The governor shall issuecommissions to the persons so appointed, designating the time forwhich they are appointed in case the appointment is to fill anunexpired term occasioned by death, resignation or any othercause whatever, and whenever the term of office of anycommissioner expires, the appointment of his successor shall befor four years.
(RSMo 1939 ยง 7646, A.L. 1943 p. 727)