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the stable atmosphere conditions at the time, conditions associated with weather inversions and which increase the refraction-index of the atmosphere. TIME/PLACE OF SIGHTING: July 9, 1947, at about 12:15 P.M. local time/in the air at an altitude of about 11,000 feet flying toward Gowen Field from a point between Boise and Meridian, Idaho. TACTICS: The object rolled over so that its edge appeared like "a thin black line" to the observer; it then performed a maneuver which looked as if it had begun a slow roll, or a barrel roll, which was broken off at about halfway around the roll: it then rolled out of the top of the maneuver and disappeared. DURATION: At least 12 to 15 seconds. NUMBER OF OBSERVERS: One. TYPE OF OBSERVER: Aviation Editor of the Statesman Newspapers, Inc., and a member of the 190th Fighter Squadron, Idaho Air National Guard. OBSERVER RELIABILITY: Good. SHAPE: Disc-shaped. DIMENSION: About the size of a quarter as seen in the distance. COLOR: Black. SOUND: None. ALTITUDE: Not determined. SPEED: Not determined.