Sec. 1. Be it enacted by the General Assembly of the State of Ohio, That it shall be the duty of the commissioners of the county of Hamilton, to examine on or before the first day of May next, all buildings wherein any gunpowder may be kept or stored by a greater quantity than one keg, within said county and without the corporate limits of the city of Cincinnati; and if upon such examination said commissioners shall be of opinion that the lives or property of the citizens, or any of them, shall be in any wise endangered by the construction or management of any such magazine or powder warehouse, it shall be the duty such commissioners forwith to notify all such owner or owners thereof, by leaving with him or them a written notice setting forth the facts on which their opinions are predicated.