As is well known to most of our readers, Ned had, at one time and another, undertaken and successfully accomplished delicate and hazardous enterprises for the United States Government. Accompanied by Frank, Jack, Jimmie, Harry, and other members of the Boy Scout Patrols of the United States, he had visited Mexico, the Canal Zone, the Philippines, the Great Northwest, had navigated the Columbia river in a motor boat, and had covered the continent of South America in an aeroplane.