In ten minutes the horses were ready, affectionate good-byes said, and Roldan and Adan, followed by many good wishes, and prayers to return, started southeastward through a dense canon. IV The vaquero guided the boys rapidly through the canon. The almost perpendicular walls, black with a dense growth of brush and scrub trees, towered so high above them that the atmosphere was damp and the long strip of sky was like a pale-blue banner. The trail was well worn, and there was nothing to impede their progress. The mustangs responded to the lifted bridle and ran at breakneck speed. They emerged at the end of half an hour. It was an abrupt sally, and the great level plain before them seemed a blaze of sunlight. "Bueno," said the vaquero, halting. "Ride straight ahead. Keep to the trail. At night you will come to a river. Before you reach it all trace of you will be lost, because between now and there are many side trails, and as the ground is so hard they cannot tell which you take. Cross the river and take the trail to the left. That will bring you to the Mission--about twenty miles farther--where the good padres will let you rest and give you fresh horses. The senor, meanwhile, will throw the officers off the scent. But if you are wise, you will make for the Sierras and hide there. Adios, senor, adios, senor;" and he wheeled about and disappeared into the darkness of the canon. "We are like the babes in the wood," said Adan. "I feel as if we never should find our way home again." "We shall," said Roldan, stoutly; although he, too, felt the chill of the immense solitude. "And we have begun well! What an adventure to start with! I am sure we shall have more." Adan crossed himself. The boys rode at a long even gallop, the high chaparral closing behind them. Every half hour they paused, and Roldan, dismounting, held his ear to the ground. But as yet they were unpursued. A soft wind blew over the plain, fragrant with the honeydew of the chaparral. The sun set in a great bank of yellow cloud. Then the night came suddenly. A few moments later Roldan called: "Halt!" and held up his hand. "I hear the rush of the water," he said. "We must be near the river." "It sounds as if it was high," said Adan. "It has rained hard this month. Suppose these horses don't swim?" "We'll make them. Come on." "Ay! yi!" exclaimed Adan, not many moments after. They pulled up suddenly on the banks of the river, a body of water about three hundred yards wide. It was swollen almost level with the high banks. The tumultuous waters were racing as if Neptune astride them was fleeing from angry gods. There is something unhuman in the roar of an angry river: it has a knell in it. Roldan and Adan looked at each other. The latter's face had paled. Roldan contracted his lids suddenly, and when his friend met the glance that grew between them he compressed his lips and involuntarily straightened himself: he knew its significance.