The lessons of the Great War, the utter ances of expert authorities like Lord Mon tagu of Beaulieu, and the newspapers gener ally, have taught the public that the naviga tion of the air will be the great and dominat ing factor of the world's progress in future. This need not be enlarged upon here.' Every one admits that the command of the air will solve the problem of intercourse between all the regions 0 globe, and will bring in its train a vast rovement in all the arts of living and a greatly-widened distribution of natural wealth.