Development of Air Service Since War Began Sketched in Lecture.

"Mr. Rees is one of the most successful men who has ever sailed the air in victory," said President Lowell in introducing Lieutenant-Colonel L. W. B. Rees of the British Royal Flying Corps in the New Lecture Hall yesterday afternoon.

Colonel Rees commenced his talk by describing the condition of the air service in England at the beginning of the war and showed how the system of generalization was supplanted by one of specialization in bombing, scouting and photographing. Then he contrasted the different types of machines and the change in the methods of fighting and observing. Two years ago the "Huns" fought in squadrons while the English never fought in more than pairs. Now the English fight in squads of ten or twelve machines, and the Germans in squads of twenty. But even in spite of the numbers, England has had the supremacy in the air.

Colonel Rees pointed out that the "importance of the work of the airplanes lies more in directing the artillery fire and in scouting and photographing than in the actual bombing of enemy trenches and positions." By means of the auxiliary maps which are made of the battlefields a pilot can report to the artillery and infantry a location to an accuracy of ten yards, he stated.