The notice of the next general election of county officers must specify that the question of forming the new county, or changing the boundaries of existing counties, as the case may be, will be voted upon at the election, and must state substantially the facts in the petition. If the proposition is for a change of boundaries, the ballots shall include the words: "For changing county boundaries. Yes. No." If for the establishment of a new county, the words: "For a new county. Yes. No." Each of the last two words, "yes" and "no," shall be followed by a square in which the voter may make a cross to indicate a choice.