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negatives certainly did not appear to be the case. It was Mr. RATHMAN's observation that had the negative been "doped" with some sort of chemical, it would have removed the emulsion from the face of the film in such a way that the negative would have been thin at the point which is supposedly a ball of fgre, whereas, in fact, both the vapor trail and the corona of fire are dark on the ‘negative, indicating that it was an actual exposure. It was the opinion of Mr‘. RATHMAN that the photographs were, without doubt, authentic. In accordance with Bureau instructions, no active investigation of this matter was made, but it was deemed advisable to interview Colonel GASSER prior to submitting the photographs to the Bureau. Colonel GASSER [predicated his remarks concerning the "flying saucers” or "mystery missiles" by /stat that he knew nothing of an official nature concerning them, other than the fact that they were believed by air force intelligence officials to be man-made missiles, rather than some natural phenomena. It was his further belief that a great deal of information had been compiled concerning these missiles by air force intelligence, and that research on the matter was being extensively done at Wright Field, Dayton, Ohio. He also expressed the opinion that information at the disposal of the United States Army a Force Intelligence had, in all probability, been made available to the Bureau at Washington, D. C. the nature of these discs, which ideas he had formulated through review of those known facts and theoretical conjectures of himself and other scientists concerning the nature of flying discs and methods of propulsion for such type of aerial mechanism. According to him, flying discs have long been a theoretical Dry possibility and, in fact, a possibility which would indicate one of the best "\y means by which to break through the barriers of the supersonic area. Scientists \' have, for many years, been attempting to develop this type of aircraft. Some experimentation has been done even in the United States, but insofar as is \s known in the United States at the present time, there have never been any practical developments. As a second factor of consideration, Colonel GASSER stated that insofar as is known to U. S. scientists at this time, there is no known chemical fuel which would make possible tremendous range of flight such as is ascribed to the reported "flying saucers." There is only one possible fuel which could be utilized which is in accord with present theory, and that is the utilization of atomic energy.| As further evidence of this possible means of propulsion, Colonel GASSER called attention to the vapor trail and gaseous corona described as a ball of fire, which he states might give some evidence to the fact that a radio-active field is present. He explained that the corona, or exhaust, has what appears to be layers of intensity which are circular rather than elongated and have no tendency to trail at the extremities, as would be the case if a normal type of exhaust from a combustion engine was being utilized in the propulsion of these aircraft. He continued that the vapor trail left by the missile appears to be one single line of uniform intensity which is extremely slow in dissipating. It was pointed out by him that in the case of a normal y [ Colonel GASSER then continued with his own ideas as to what might be % x " a