Traffic accidents differ from non-traffic accidents where the injuries are concerned. With the males two thirds of the thoracic injuries happened in non-traffic accidents and one third in road accidents; with the females, the relation was reversed. In thirteen per cent of the traffic accidents and in twenty-five per cent of the non-traffic accidents there were only thoracic injuries, in the other cases there were multiple injuries. Blunt damages of the thorax occurred in the majority of both kinds of accidents, penetrating injuries were less common. Closed rib fractures happened twice as often in traffic accidents as in accidents at work. Compound fractures of the ribs were three times as frequent in non-traffic accidents as in traffic accidents. In thirty-five per cent of road accidents and in twenty-two per cent of non-traffic accidents the injuries were of an intrathoracal kind. Of all the three hundred and thirty thorax injured patients thirty-four did not survive their injuries, twenty-nine due to traffic accidents, and five due to non-traffic accidents.