When the red glow was at its deepest he saw in the very core and heart of it that for which he was looking. Eye-high on the stalwart trunk of an oak were four parallel slashes from the keen blade of a tomahawk. They could not have been put there by chance. A powerful hand had wielded the weapon and the four cuts were precisely horizontal and close together. He had found his word. It was as plain as day. The four had passed there and they had left for him a letter telling him all about it. This was only the first paragraph in the letter, and he would find others farther on, but he devoted a little time to the examination of the first. He studied minutely the cuts and the cloven edges of the bark, and he decided that they were at least two weeks old. So the letter had been posted some time since, and doubtless its writers had gone on to another region. But if they posted one letter they would post others, and he felt now that communication had been established. True, the chain connecting them was long, but it could be shortened inch by inch. He made a series of widening circles about the tree, looking for the second paragraph of the letter, and he found it about a hundred yards to the eastward, exactly like the first, four parallel slashes of a tomahawk, eye-high, deep into the trunk of a stalwart oak. He found a third paragraph precisely like the first and the second, a hundred yards farther on, and then no more. But three were enough. They indicated clearly the course of the four which was into the northeast. In the morning he would change his own direction to conform with theirs. The letter gave him a great surge of the heart, but the night came down quickly, dark and cold, the bitter wind blew again, and the ice fell about him in a rain of chill crystals. He knew that the temperature was falling fast, and that it would be his hardest night so far. He must have a fire, risk or no risk, and it was a full three hours before he was able to coax one from dead wood that he dragged from sheltered recesses. Then it felt so good that he built a second, intending to sleep between them. His supply of food was low, but knowing how needful it was to preserve his strength and the full fresh flow of his blood, he ate of it heartily, and, then when the ground, wet between the fires from the melted ice, had been dried by the heat, he made his bed and slept well, although he awoke once in the night and finding the cold intense put fresh wood on the fires.