Day after day he watched the progress of that white palisade; day after day he scanned the heavens for a sign of change, for out of the sky alone could come his deliverance. Hourly tests were made at the bridge site, lest the ice should give way before the pressure from below and by moving up-stream destroy the intricate pattern of piling which was being driven to support the steelwork. But day after day the snows continued to melt and the rain to fall. Two rivers were now boiling past the camp, one hidden deep, the other a shallow torrent which ran upon a bed of ice. The valley was rent by the sounds of the glacier's snail-like progress. Then, without apparent cause, the seasons fell into order again, the mercury dropped, the surface-water disappeared, the country was sheeted with a glittering crust over which men walked, leaving no trace of footprints. Jackson became silent: once again the wind blew cold from out of the funnel-mouth and the bridge-builders threshed their arms to start their blood. But the glacier face had advanced four hundred feet from its position in August; it had narrowed the Salmon by fully one-half its width. Fortunately, the bridge had suffered no damage as yet, and no one foresaw the effect which these altered conditions were to have. The actual erection of steelwork was impossible during the coldest months; Parker had planned only to rush the piers, abutments, and false-work to completion so that he could take advantage of the mild spring weather preceding the break-up. The execution of this plan was in itself an unparalleled undertaking, making it necessary to hire double crews of picked men. Yet, as the weeks wore into months the intricate details were wrought out one by one, and preparations were completed for the great race. Late in March Dan Appleton went to the front, taking with him his wife and his sister, for whom O'Neil had thoughtfully prepared suitable living-quarters. The girls were as hungry as Dan to have a part in the deciding struggle, or at least to see it close at hand, for the spirit of those engaged in the work had entered them also. Life at Omar of late had been rather uneventful, and they looked forward with pleasure to a renewal of those companionable relations which had made the summer months so, full of interest and delight. But they were disappointed. Life at the end of the line they found to be a very grim, a very earnest, and in some respects an extremely disagreeable affair: the feverish, unceasing activity of their friends left no time for companionship or recreation of any sort. More and more they, too, came to feel the sense of haste and strain pervading the whole army of workers, the weight of responsibility that bore upon the commander.