SEC. 1. That it shall not be lawful for any person in said city, with out permission from the mayor or city marshal, to fire or discharge any cannon, musket, rifle, fowling-piece, pistol, or other firearms or air-guns, except it is done in cases of necessity, or in the performance of a public act of lawful duty, or by military companies when on parade or in the discharge of duty; and every person violating the provisions of this sec tion shall, on conviction, forfeit and pay not less than one dollar por more than one hundred dollars for every offense.