By Capt. S. P. Meek Another episode in Dr. Bird's long scientific duel with his country's arch-enemy, Saranoff. The milling crowd in front of the Capitol suddenly grew quiet. A tall portly figure came out onto the porch of the building and stepped before a microphone erected on the steps. A battery of press cameras clicked. A newsreel photographer ground away on his machine. Wild cheers rent the air. The President held up his hand for silence. As the cheering died away he spoke into the micropho