Then he took three turns of the copper wire around the empty insulator. Now was the trying moment. If he cut the line, would its sagging weight break his splice of copper wire? Yet if he was to carry out his plan he must separate the telegraph line into two parts, so that by bringing the ends together he could make the Morse signals. With a few nips of the pliers he cut the telegraph line, and although it fell away with a sharp snap, the copper-wire splice held it safely hung to the new insulator. Now he was in possession of a rude but effective telegraph key. By touching the west end of the broken line, which was the jagged bit of wire that stuck up from the old insulator, against the east end of the line, which was the end of the copper wire leading back from the new insulator, he could complete the electric circuit. He tapped the end of the copper wire upon the line wire that stuck up. A tiny blue spark flashed out, and he felt sharp pains in his wet right hand as the current shot through it. But what mattered the pain? Because the current shocked him so, he felt sure that the line was "O K." Now he began tapping again. He let the wires barely touch to make dots, and held them together an instant to make dashes. He began to call up the station at Woodside, where No. 576 was due to pass within the next ten minutes. Then he held the wire ends together to receive an answer. He soon could feel the stinging, burning current bite the dots and dashes into his hand like this: "-- -- -- -- -- ---- ---- ---- -- --." Now he telegraphed this order: "Operator, Woodside,--Flag and hold all west-bound trains. Williston cut blockaded, and a special is stuck at east end." He signed Mr. Gannon's name to this. Then he held the wires together while the operator telegraphed back the order, according to the railroad rules, to show that he understood. The man at Woodside was surprised at the message, but he quickly understood its importance. Harry twisted the loose end of the copper wire around the little piece of wire that stuck up, so that the telegraph line should not be broken, and then he slid down the pole. "They're holding all west-bound trains at Woodside!" he shouted to Phil as his feet touched the ground. Phil gave him a congratulatory slap on the back that nearly upset him. Then Phil ran to where the superintendent and the train crew were standing, two hundred yards back of the train, trying to shield a red light and keep it burning. He yelled the good news to them, and as Harry came slowly up to the little group, the crew cheered him and hugged him and told him he had saved the six lives on No. 576. "Bub," said Mr. Gannon, as he gravely shook Harry's burned right hand, "I guess you've had enough experience to go to 'X' office. We need men as quick-witted and plucky as you in this business. I'm going to report your conduct to the directors of the road at their next meeting." HOW MAGIC IS MADE. I. When Samuel Butler wrote