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viii FOREWORD I recall one occasion, when I took up an airplane equipped with a receiving set, while the control station (which is almost invariably a radio telephone) was placed on the ground. A distinguished group of people was present, several taking de- light in furnishing me with orders for maneuvering. These voices were received with the utmost clarity, and the orders readily accomplished. The whole affair seemed more than miraculous to most of those present, but I am sure that more than one thought there must have been some trickery. There were scattered clouds, and this condition gave someone a happy thought. I received instructions to enter a nearby cloud, one of the large, white, billowy kind that from above seem solid enough to walk upon. I promptly disappeared from the sight of those below. Then I received instructions to spin out and come out of the spin facing the Capitol. This was immediately executed, and the doubters became enthusiastic believers, as they had previously thought I must have been receiving some kind of visual signals. The Army, Navy and Post Office Departments are all busily engaged in providing all of their airplanes with airplane radio sets, and practically all of these aircraft will utilize radio telephony. The Post Office Department will soon install such sets on all of its transcontinental air mail planes, as a pre- liminary step to night flying. All the known radio aids to air navigation will also be provided. What could be more fascinating than to sit by your own fireside and follow the mail across the heavens on a stormy night? The ether of the near future will be full of thrills provided by man's epic conquests of the elements. I do not doubt but that the exploring parties of the future will carry complete radio sets with them as one of the essentials. Then the time will come when the daily incidents of the explorations