Once upon a time the youngest son of a king became filled with the desire to go abroad and see the world. He got his father's permission to depart, kissed his parents good-bye, mounted his black horse, and galloped away down the high road. Soon the gray towers of the old castle in which he was born hid themselves behind him. The Prince journeyed on, spending the days in traveling, and the nights in little wayside inns, till one day he found himself in the heart of the Adamant Mountains. The great, red granite crags of the surrounding peaks rose out of the gleaming snow like ugly fingers, and the slopes of giant glaciers sparkled in the sun like torrents of diamonds. The Prince sat down by some stunted trees whose tops had long before been broken off by an avalanche, and began to eat the bit of bread and cheese which he had stored in his pocket. His black horse, meanwhile, ate the grass which grew here and there along the mountain path. And as the Prince sat there in the bright sun and the silence of the mountains, he became aware of a low, continuous roaring. "There must be a waterfall near-by," said the Prince to himself. "I'll go and see it." So, casting another look at his steed, who was contentedly browsing, the Prince climbed up the mountainside in the direction of the sound. The Prince climbed and climbed, he went in this direction and in that, yet the sound never grew any louder or fainter. Suddenly he realized that he was hopelessly lost. The little path up which he had ridden had vanished completely, and he had not the slightest idea in which direction it lay. He called aloud, but only the mountain echoes answered mockingly. Night came, and the Prince took shelter behind a great rock. All the next day he labored to find the path, but in vain. He grew very hungry and cold. Every once in a while he would hear the roaring of the waterfall, which seemed to have grown louder. Another day dawned, and another day again. The Prince was getting very weak. He knew that he was approaching the mysterious cataract, for the noise of the water was now tremendous, and heaven and earth were full of its roar. The third night came, and the full moon rose solemnly over the snow-clad summits of the lonely and mysterious mountains. Suddenly the Prince, walking blindly on, staggered through a narrow passage-way between two splintered crags, and found himself face to face with the mystery.