51. Whenever each of the townships composing a municipality of united townships has a population of at least 300 souls, the Lieutenant-Governor, upon petition signed by a majority of the proprietors of immovable property, from all or from one township only, may, subject to article 48 and articles 64 and following, abolish the municipality of the united townships and erect each such township into a municipality, under the name of: “Municipality of the township of (name of the township)”.