ield, General Sir Arthur Sloggett. Through him
and his deputy, General Macpherson, went all the general orders
affecting the health of the army.

At the head of each army medical service is a Surgeon-General (D.M.S.,
or Director of Medical Services), and at the head of each corps a full
colonel (D.D.M.S. or Deputy Director of Medical Service). The chief
medical man of each division is also a full colonel (the A.D.M.S. or
Assistant Director of Medical Services), and he is responsible for the
operation of the field ambulances and the evacuation of the wounded to
the casualty clearing station while his division is in the firing
line. The medical officers of battalions and the sanitary squad are
also under him.

The casualty clearing stations and the mobile laboratories, are under
the D.M.S. of the army, who is responsible for the clearing of the
hospitals by motor ambulance convoys and by hospital train.

There are normally three field ambulances to each division and one
casualty clearing station. The number of base hospitals to each
division is normally two, but as many of these are utilized as are
needed. They are scores of miles from the fighting zone, and do not
particularly concern us here.

When a battalion medical officer or sanitary officer wishes to make a
report or suggestion he does so through the A.D.M.S. of the division.
In the same way the A.D.M.S. of the division communicates with the
D.D.M.S. of the corps; the D.D.M.S. of the corps with the D.M.S. of
the army, and the D.M.S. of the army with the D.G.M.S. at G.H.Q. A
battalion medical officer cannot go over the head of his A.D.M.S.,
nor could the latter pass his D.D.M.S. to make a report or suggestion.
Everything must go up or down the system through the various heads,
and no side stepping is permitted.

The front line trenches were about seven miles from our laboratory
which was located in a town with three casualty clearing stations, a
railroad and canal. This made it possible to evacuate the wounded
rapidly to the base by means of hospital trains and barges during an
engagement.

The system which enables a sick or wounded man to be removed from the
front is simple enough. Each day the medical officer of a battalion,
who himself may be located in a dug-out in the trenches themselves or
in a cellar of a house not far behind the trenches, holds a "sick
parade" at his "regimental aid post." During a battle the wounded are
collected by the regimental s