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A Mysterious Vale. After a while they lost sight of it and saw it no more. They crossed the sandy plain towards the glacier, and scrambled up a spur of loose shingle, till they reached a river that burst out from beneath the ice. There the glacier became very steep, and they did not see how to take their horses farther, as on all sides were seracs of ice, and fissures and crevasses of immense depth. Then Björn made a vow that he would take his horse, named Skoli, over the glacier, and not leave the ice-mountain except on the eastern side, provided this was not contrary to the will of God. Then Helgi made a vow that if he met with any human beings, male or female, in Thorir's dale, he would endeavour to Christianise them; and Björn promised to assist him in this to the best of his power. And they agreed to baptize immediately all the people in the valley who might be willing to embrace Christianity. They thought it prudent to leave behind them one of their horses, their baggage and the tent, at a rock near the river. On this rock they piled up three cairns as evidence that they had been there; and there, also, they left the boy in charge of the horse, with strict orders not to stir till their return, which would be in the night or on the following day. They took with them a bottle of corn-brandy, remarking that the men of Aradalr would probably be quite ignorant of its properties. They took no weapons, except small knives, and each had a spiked staff, to assist him in climbing the ice. Both the clergymen and Björn 229