As "Billy" Brackett turned and missed the companion whom he supposed was close behind him, his heart sank like lead. In vain did he shout. Not even an echo answered him. His loudest tones were snatched from his lips by the wind, torn into fragments, and indistinguishably mingled with its mocking laughter. It was barely possible that Glen might have turned back; and, with the slender hope thus offered, the engineer retraced his perilous way across the snow-field to the place where they last stood together. It was empty and awful in its storm-swept loneliness. A great terror seized hold upon the man's stout heart; and, as he again crossed the treacherous snow, he trembled so that his reaching the rocky shelf beyond was little short of a miracle.