five o'clock
Miller turned his head but did not pause . `` Yep , '' he answered , `` about dark . '' Again in silence they went on . Finally , at five o'clock , they began to climb the gentle slope of a mountain which seemed to have no summit . Here for the first time his guide stopped to allow Ross to rest . Then he advanced slowly , step by step , prodding the snow deeply at the left of the blind trail he was following . `` What 's the matter ? ''