Section 4. Every one who shall hereafter carry concealed about his person, a bowie knife, or knife or instrument of the like kind or description, by whatever name called, dirk or any other deadly weapon, pistol or any species of fire arms, or air gun, unless such person shall be threatened with, or have good cause to apprehend an attack, or be travelling, or setting out on a journey, shall on conviction, he fined not less than fifty nor more than three hundred dollars: It shall devolve on the person setting up the excuse here allowed for earrying concealed weapons, to make it out by proof, to the satisfaction of the jury; but no excuse thall be suflicient to authorize the carrying of an air gun, bowie knife, or knife of the like kind or description.