She sat down limply on the ground. Racey started back across the stringer to get the horse. He hurried, too. That posse they had seen in the valley! There was no telling where it was. It might be four miles away, or four hundred yards. "C'mon, feller," said Racey, picking up the reins of the tired horse. "And for Gawd's sake pick up yore feet! If you don't that dynamite is gonna make one awful mess at the bottom of the cañon." Dynamite! Mess! There was an idea. Although in order to spare Molly an extra worry for the time being, he had told her they would push on together, it had been his intention to hold the bridge with his rifle while Molly rode alone to the Cross-in-a-box for help. But those six sticks of dynamite would simplify the complex situation without difficulty. He did not hurry the horse. He merely walked in front holding the bridle slackly. The horse followed him as good as gold--and picked up his feet at nearly every spike. Once or twice a hind hoof grazed a spike-head with a rasping sound that sent Racey's heart bouncing up into his throat. Lord, so much depended on a safe passage! For the first time in his eventful life Racey Dawson realized that he possessed a full and working set of nerves. When they reached firm ground Racey flung the reins to Molly. "Unpack the dynamite," he cried. "It's in the slicker." With his bowie he began furiously to dig under the end of the stringer where it lay embedded in the earth. Within ten minutes he had a hole large enough and long enough to thrust in the whole of his arm. He made it a little longer and a little wider, and at the end he drove an offset. This last that there might be no risk of the charge blowing out through the hole. When the hole was to his liking, he sat back on his haunches and grabbed the dynamite sticks Molly held out to him. With strings cut from his saddle, he tied the sticks into a bundle. Then he prepared his fuse and cap. In one of the sticks he made a hole. In this hole he firmly inserted the copper cap. Above the cap he tied the fuse to the bundle with several lappings of a saddle-string. "There!" he exclaimed. "I guess that cap will stay put. You and the hoss get out of here, Molly. Go along the trail a couple of hundred yards or so. G'on. Get a move on. I'll be with you in a minute. Better leave my rifle." Molly laid the Winchester on the grass beside him, mounted the horse, and departed reluctantly. She did not like to leave Racey now. She had burned out her "mad". She rode away chin on shoulder. The cedars swallowed her up. Racey with careful caution stuffed the dynamite down the hole and into the offset. Then he shovelled in the earth with his hands and tamped it down with a rock. Was that the clack of a hoof on stone? Faint and far away another hoof clacked. He reached up to his hatband for a match. There were no matches in his hatband. Feverishly he searched his pockets. Not a match--not a match anywhere!