Service in two years of the great war, with an interval visit to civil life, leads one readily to comparative views. The periods of service have been passed at base hospitals and casualty clearing stations under British Expeditionary Force control. About one half of the base hospital work was performed under clearing station conditions, and it is desired to convey to readers in the United States a general conception of the progress of war surgery and of the detailed work of advanced casualty clearing stations.
ORIGINAL FUNCTION OF CASUALTY CLEARING STATIONS
The original function of casualty clearing stations was to act as a very advanced collective depot for patients from contributory field ambulances with their outlying dressing posts. The position selected was one within a few miles of the firing line, fairly well isolated and remote if possible from the danger of active shelling (chance shelling and aerial bombing must