Of Explosive Compounds. Penalty for selling guns, pistols, cartridges, etc., to children. § 1. Whoever sells to a child under the age of sixteen years, without the written consent of its parent or guardian, any cartridge or fixed ammunition of which any fulminate is a component part, or a gun, pistol, or other mechanical contrivance arranged for the explosion of such cartridge or of any fulminate, shall be liable to a penalty of not less than five nor more than fifty dollars.

Ordinances of the City of Boston. Of Fire-Arms, Bonfires, and Brick-Kilns. § 4. No person shall sell to any child under the age of sixteen years without the written consent of a parent or guardian of such child, any cartridge or fixed ammunition of which any fulminate is a component part, or any gun, pistol, or other mechanical contrivance arranged for the explosion of such cartridge, or of any fulminate. But the provisions of this section shall not apply to paper caps of which the only component parts are chlorate of potash and sulphide of antimony, nor to any appliance …