That upon the petition of twenty or more inhabitants of, and owners of lands within, any one of such land grants, it shall be the duty of the board of county commissioners of the said county of Dona Ana to order an election to be held for the choice of a board of trustees for the grant specified in the petition. Such board of county commissioners shall appoint three competent and disinterested persons, qualified to vote under the provisions of this article, to serve as judges of such election and shall by proclamation printed at least once a week for two successive weeks in some newspaper of general circulation published in the said county of Dona Ana give notice of the time and place of such election and the objects thereof.