aëroplane is above, and as the result of this, one well-recognized method of temporarily silencing an enemy's battery is to keep an aëroplane flying over its neighborhood. Volunteer observers are frequently disguised and sent forward to hunt for a place from which they can observe the hostile trenches of artillery and thus direct and correct the fire of their own batteries. Observers who thus volunteer to go forward are virtually always decorated and made officers, if, by some fortunate chance, they both succeed and survive. The French artillery officers take advantage of every "assist"; for instance, I saw a case where a shell made a groove on the reverse side of a hill and glanced off. The shell exploded, but its fuse was recovered by the French, the setting of the fuse determined, and by means of this and the direction of the groove made in the hill the German battery was located. The French reported that they had destroyed the battery. One of their aëroplanes was sent up before firing was begun and later observed the battery's efforts to escape. The French batteries are usually so far behind the infantry that when they have come under heavy artillery fire there is no danger of capture. The custom with the French seems to be, in a case like this, for the personnel to run and take cover during the bombardment. I saw this happen twice, and I learned of numerous other cases. Cover underground is constructed for all the personnel of the batteries. One enters these subterranean quarters through entrances which look very much like enlarged woodchuck holes. With no artillery of any nationality did I see any gun entrenchment other than a slight mound of earth coming up to the bottom of the shield. All guns that I have seen were in a line, except in cases where there was some peculiar rising of terrain. I have several times seen a "group" together in one line, at intervals of about twenty yards. In practice, the French tend to extend the intervals to about twenty-five yards, while the Germans either decrease them to about fifteen yards, or have the guns quite isolated, seventy-five or one hundred yards apart. Telephones are the only instruments of which I have observed the use in the immediate neighborhood of French batteries. The battery commander controls the fire by word of mouth. The French 75-mm. gun is the only field-piece which under practical field conditions does not "jump." This gives a tremendous advantage to the French artillery in such duels as frequently take place in battles where there is rapid movement. I have been on battlefields after action had finished and observed positions where two batteries had shot at each other, both being in "direct fire" position. The French pieces can fire at a rate of twenty-five shots a minute and in such duels seem to be able to fire accurately with nearly twice the rapidity of the Germans.