They followed along the Platte River, and stopped for a time at the junction of the North Fork of that River with the South Fork, where North Platte is now situated. Here they tell of watching the beavers cut down a cottonwood tree. They observed that when it was nearly ready to fall, one of the beavers swam out into the river and posted itself as a sentinel. As soon as it saw the tops of the branches begin to move, it gave the signal by giving the water a resounding slap with its flat tail, when every beaver scampered out of reach of the falling tree. It must have been a moonlight night when they were there, otherwise they would not have seen the beavers at work, for they reverse nature's order and sleep in the daytime, working at night. They sleep in their houses, with their bodies in the water, and their heads resting out of the water on a stick. At twilight, a wise old mother beaver comes out and swims all around the pond or river, looking and smelling. Their sense of smell is very keen, and those who wish to observe them do so from treetops near the water. If after a careful investigation, the sentinel decides there are no man people, or wild animals around, one slap of the tail on the water is given, and out pops the nose of every beaver of the band, and all proceed with their work, exactly where it ended at sunrise. If the one on picket duty sees or hears anything that seems suspicious, three sharp resounding strokes of the tail sends every beaver in a flash to his hiding place, and nothing will tempt them out again that night. They have an instinct for making a tree fall in exactly the place where they want it, and it is used as a foundation for the numerous dams they build in the streams. On June 30th, Long's party got their first glimpse of the Rocky Mountains. Later on, when they were camped near Ft. Lupton, opposite the Peak, they gave it the name of Long, its altitude being fourteen thousand two hundred and seventy feet. None of the party were ever near the Peak. Two of them, more courageous than the others, rode out one memorable morning, under a cloudless sky, with their faces towards the snowy range--rode away to defeat and oblivion. As morning turned to noon and they seemed no nearer to the pinnacle than when they started, they retraced their steps across the silent plain. Thus they lost an opportunity of forever linking their names to undying fame. Had they proceeded, they could have electrified a nation by writing into their report a page that would have remained undimmed to the end of time. It was theirs, had they embraced it, to have discovered Estes Park, the gorgeous setting that crowns the approach to the King of Peaks. But they turned back; back from the snow-white mountains beckoning them onward; from the purple tints that veiled the mystic summits in a mellow haze; from the lights and shadows playing over hill and dale, under a canopy of fleecy clouds.