A  telephone bell jangled insistently. The orderly on duty dropped his feet from the desk to the floor and lifted the receiver with a muttered curse. "Post hospital, Aberdeen Proving Ground," he said sleepily, rubbing his eyes. A burst of raucous coughing answered him. Several times it ceased for an instant and a voice tried to speak, but each time a fresh spasm of deep-chested wracking coughing interrupted. "Who is this?" demanded the now aroused orderly. "What's the matter?" Between intervals