That there shall be a quadrennial election of officers of the Osage Tribe as follows: A principal chief, an assistant principal chief, and eight members of the Osage tribal council, to succeed the officers elected in the year 1928, said officers to be elected at a general election to be held in the town of Pawhuska, Oklahoma, on the first Monday in June 1930 and on the first Monday in June each four years thereafter, in the manner to be prescribed by the Commissioner of Indian Affairs, and said officers shall be elected for a period of four years commencing on the 1st day of July following said elections. *  *  *