But his honor as a reliable borderman was in the balance. He could not forget that, chiefly through his carelessness, there had been lost a paper entrusted to his charge, which was of the utmost value to these lads. Hence he was firmly resolved to stand by them, no matter what happened, for the object of their venture was to duplicate the document he had allowed to slip out of his hands. "There is the river over yonder; I can see the sun shining on the tumbling water of one of the numerous cataracts," Dick commented, as he pointed in the direction indicated. "The Indians have a story to the effect that it springs from a great fresh water inland sea lying over the ridges somewhere," Roger remarked, as he stood looking at the foaming surface of the stream. "Do you believe there is any truth in that account, Dick; or can it be set down as a fable, like this Evil Spirit of the land?" "Oh! it seems that others have looked upon the great lake at a distance, French traders and voyageurs, and they say it is surely there," the other affirmed. "Who knows but that, before we see our good friend Captain Lewis again, we, too, may be able to boast of having set eyes on the mirror lake." "Captain Lewis told me he would give much for the privilege of accompanying us; but duty would not permit," Roger observed. "Yes, he cannot forget that the President committed the fate of this exploration into his hands, and looks to him to supply all the information possible," said Dick. "So Captain Lewis, like an honorable and conscientious gentleman, will not take any unnecessary risk in order to gratify his curiosity. His place is there in the camp." Feeling hungry as noon arrived they munched some of the hard pemmican while keeping on the move. That suited the impetuous Roger, for it was virtually "killing two birds with one stone"; they satisfied their hunger, and yet found no reason to delay their progress in order to do so. Mayhew still found a way to discern the trail of those who had gone over this same ground ahead of them. Indeed, it would have to be a faint track that his practiced eyes failed to discover. All this while there had been a perceptible change in the character of the country. It kept getting more rocky, and wilder the further they advanced. Roger was constantly looking on all sides as though expecting to discover some new and remarkable thing at any minute. Indeed, Dick was also considerably worked up over the strange conditions surrounding them, and made up his mind not to be surprised at anything that might happen. It was when they were in this receptive frame of mind that something occurred out of the common, to alarm them. Roger was the first to hear a sound, though Dick, seeing him come to a sudden halt, and stand in an attitude of listening, also began to catch it. "Hold on, Benjamin," said Dick, in a low tone, "there's something queer going on around us that we must look into before proceeding further."