Police-officer not to resign without leave or two months’ notice

No police-officer shall be at liberty to withdraw himself from the duties of his office, unless expressly allowed to do so by the District Superintendent or by some other officer authorized to grant such permission, or, without the leave of the District Superintendent, to resign his office, unless he shall have given to his superior officer notice in writing for a period of not less than two months, of his intention to resign.