Few persons are familiar with the simple problems of the air which have such important bearing on the distribution of man into realms above those he has been accustomed to occupy. They do not know that the northwest wind brings physical energy and mental buoyancy because it has a downward component of motion that draws air from above, where it is free of impurities, and where high electrification has changed a considerable quantity of its oxygen into ozone, in which condition it remains but a short time after reaching the lower potential near the earth’s surface. More people die under the influence of the south wind than under the influence of the north wind, because the south winds hug the surface of the earth and become laden with impurities and are lacking in electrical stimulation. When inventive man becomes more familiar with the ocean on the bottom of which he has heretofore lived, he will not wait for the north wind to bring down to him the beneficial conditions that always exist higher up; he will go after them and remain aloft as long as he desires to do so. The further development of the dirigible balloon and the aëroplane are among the most important duties that the engineer of the future owes to civilization; and the meteorologist must establish the climatology of the vast untracked regions above the highest mountain peaks, for here man will largely disport himself in the time to come. The writer agrees with the opinion of Major William R. Blair, formerly of his staff when he was the head of the U. S. Weather Bureau, but since the beginning of the World War the chief meteorological assistant of the Chief Signal Officer of the U. S. Army when he says: “With reference to air travel in the future: the present stage of aircraft development seems to indicate that long non-stop traffic, both freight and passenger, in the air will be by means of lighter-than-air craft (balloons). These craft have much larger carrying capacity than any airplanes now designed and will travel across the continent over several prepared routes, stopping only at important centers on these routes to discharge and take up passengers and freight. It is believed that airplanes (heavier-than-air craft) will ply between these important centers and the outlying country about them, thus acting as feeders to the main route, over which the monstrous dirigibles will operate. Most transoceanic as well as transcontinental air traffic will probably be carried on in these large dirigible balloons.” Lieutenant Colonel Henry B. Hersey, who served through the World War in the Aëronautical Service of the Signal Corps, U. S. A., and who also was associated with the writer in the management of the Weather Bureau, says: