Eight councillors shall be annually chosen by the inhabitants of this commonwealth, qualified to vote for governor. The election of councillors shall be determined by the same rule that is required in the election of governor. The legislature, at its first session after this amendment shall have been adopted, and at its first session after the next state census shall have been taken, and at its first session after each decennial state census thereafterwards, shall divide the commonwealth into eight districts of contiguous territory, each containing a number of inhabitants as nearly equal as practicable, without dividing any town or ward of a city, and each entitled to elect one councillor: provided, however , that if, at any time, the constitution shall provide for the division of the commonwealth into forty senatorial districts, then the legislature shall so arrange the councillor districts that each district shall consist of five contiguous senatorial districts, as they shall be, from time to time, established by the legislature. No person shall be eligible to the office of councillor who has not been an inhabitant of the commonwealth for the term of five years immediately preceding his election. The day and manner of the election, the return of the votes, and the declaration of the said elections, shall be the same as are required in the election of governor. [Whenever there shall be a failure to elect the full number of councillors, the vacancies shall be filled in the same manner as is required for filling vacancies in the senate; and vacancies occasioned by death, removal from the state, or otherwise, shall be filled in like manner, as soon as may be after such vacancies shall have happened.] And that there may be no delay in the organization of the government on the first Wednesday of January, the governor, with at least five councillors for the time being, shall, as soon as may be, examine the returned copies of the records for the election of governor, lieutenant-governor, and councillors; and ten days before the said first Wednesday in January he shall issue his summons to such persons as appear to be chosen, to attend on that day to be qualified accordingly; and the secretary shall lay the returns before the senate and house of representatives on the said first Wednesday in January, to be by them examined; and in case of the election of either of said officers, the choice shall be by them declared and published; but in case there shall be no election of either of said officers, the legislature shall proceed to fill such vacancies in the manner provided in the constitution for the choice of such officers. [See Amendments, ArtsXXV, LXIV and LXXX]