Am'bulance, originally, a four-or two-wheeled wagon fitted up for the conveyance of injured persons. In the armies of the world the term was applied to movable field hospitals, especially those controlled by the Red Cross Society. Ambulances are now motor-driven vehicles. Every principal city in America has its hospitals and police departments equipped with excellent ambulances in the charge of qualified surgeons. These vehicles, having the right of way over other vehicles, respond to accident calls sent by the police, and render most efficient first aid to the injured and then convey them to hospitals or homes. Ambulances are also provided for the conveyance of injured animals.