If at any time the Legislature by a vote of two thirds of the Members elected to each house, shall determine that it is necessary to cause a revision of this entire Constitution they shall recommend to the electors at the next election for Members of the Legislature, to vote for or against a convention, and if it shall appear that a majority of the electors voting at such election, shall have voted in favor of calling a Convention, the Legislature shall, at its next session provide by law for calling a Convention to be holden within six months after the passage of such law, and such Convention shall consist of a number of Members not less than that of both branches of the Legislature. In determining what is a majority of the electors voting at such election, reference shall be had to the highest number of votes cast at such election for the candidates for any office or on any question.