Then we took the Porcupine trail and climbed for about two miles the gentle slope to the top of the first rising ground. There we stayed and watched the sun take his nightly plunge into the sea of mountains, now dimly visible. Behind us stretched the prairie, sweeping out level to the sky and cut by the winding coulée of the Swan. Great long shadows from the hills were lying upon its yellow face, and far at the distant edge the gray haze was deepening into purple. Before us lay the hills, softly curving like the shoulders of great sleeping monsters, their tops still bright, but the separating valleys full of shadow. And there, far beyond them, up against the sky, was the line of the mountains—blue, purple, and gold, according as the light fell upon them. The sun had taken his plunge, but he had left behind him his robes of saffron and gold. We stood long without a word or movement, filling our hearts with the silence and the beauty, till the gold in the west began to grow dim. High above all the night was stretching her star-pierced, blue canopy, and drawing slowly up from the east over the prairie and over the sleeping hills the soft folds of a purple haze. The great silence of the dying day had fallen upon the world and held us fast.