256. That it shall be unlawful for any person in said city, without permission from the mayor or superintendent of police, to fire or discharge any cannon, musket, rifle, fowling piece, pistol, or other fire-arms or air-guns, except it is done in cases of necessity, or in the performance of a lawful act, or by military companies when on parade or in the discharge of duty; and every person violating the provisions of this section shall, on conviction, forfeit and pay not less than one dollar nor more than one hundred dollars for offense.