"I know it is hard, hard on us all, and especially hard on you two boys," Mr. Conroyal said, turning sympathetically to the lads. "But it would be foolish to waste any more time here. Now, let us have a last look at that map, before we fling the cussed thing into the fire," and he motioned Thure to hand him the skin map. "We don't want it to fool anybody else." Thure slowly took the map from its place of concealment in his shirt bosom and reluctantly handed it to his father. Then all bent their heads over it; but there was little interest in their faces. They had examined the map too often and too closely to hope to find anything new in it now. Suddenly Mrs. Dickson uttered a little exclamation and pointed with her finger to the roughly drawn tree in the left hand corner of the map. "I wonder if that tree, with the arrow pointing downward toward the east point of the cross, does not mean something," she said. "Moses!" yelled Thure, jumping to his feet excitedly. "It does! It's the key to the whole secret! I remember now! The miner said the gulch was blocked by great rocks, that we must climb the Big Tree to the third limb. You remember, don't you, Bud?" and he turned excitedly to Bud. "Yes," answered Bud, now as greatly excited as was Thure himself. "He said, 'Climb to the third limb. Remember, climb to the third limb--third--third--' and then he choked all up. Come! It is yet light enough to see!" and both boys made a jump for the huge trunk of the great oak tree and began climbing up it almost with the agility of two squirrels. "Gosh! Thar might be somethin' in that!" and Ham, and all the others, jumped to their feet and followed the movements of the two boys with deeply interested eyes. The third limb was about twenty feet from the ground, of huge size and thrust itself straight out to the rocky wall of the canyon, against which its end appeared to be tightly pressed. Along this limb Thure and Bud now scrambled, as swiftly as hands and feet and body could propel them, Thure in the lead. The limb was sufficiently large and strong to make this neither difficult nor dangerous. In a few minutes they were at the face of the wall of rock. Here Thure paused for a moment, then he was seen to rise on his feet, push a few branches aside, and, with a yell, disappear. The next moment he was followed by Bud. "Wal, I'll be teetotally durned!" and Ham and the others stared blankly at the spot where the two boys had disappeared. For five minutes they stood staring at the spot, without speaking a word, so intense was their interest. Then the heads of the two boys appeared through the branches almost simultaneously; and a loud yell of triumph broke wildly from the mouth of each. "Found! Found!" yelled Thure. "We've found the gulch! Crooked Arm Gulch!" cried Bud. "Come up and see."