At the upper and lower ends of the track where the roadbed had not completely disappeared the full force of section men, backed by the irrigation laborers, were busy patching the holes.

At the point where the break was complete and the Rat River was viciously licking the vertical face of the rock a crew of men, six feet above the track level, were drilling into the first ledge a set of six-foot holes. On the next receding ledge, twelve feet above the old track level, a second crew were tamping a set of holes to be sunk twelve feet. Above them the drills were cutting into the third ledge, and still higher and farther back, at twenty feet, the largest of all the crews was sinking the eighteen-foot holes to complete the fracture of the great wall. Above the murmuring of the steel rang continually the calls of the foremen, and hour after hour the shock of the drills churned up and down the narrow cañon.

During each hour Glover was over every foot of the work, and inspecting the track building. If a track boss couldn't understand what he wanted the engineer could take a pick or a bar and give the man an object lesson. He patrolled the cañon walls, the roadmasters behind him, with so good an eye for loose bowlders, and fragments such as could be moved readily with a gad, that his assistants before a second round had spotted every handy chunk of rock within fifty feet of the water. He put his spirit into the men and they gave their work the enthusiasm of soldiers. But closest of all Glover watched the preparations for the blast on the Cat's Paw.

Morris Blood in the meantime was sweeping the division for stone, ballast, granite, gravel, anything that would serve to dump on Glover's rock after the blast, and the two men were conferring on the track about the supplies when a messenger appeared with word for Glover that Mr. Brock's party were coming down the cañon.

When Glover intercepted the visitors they had already been guided to the granite bench where his headquarters were fixed. With Mr. Brock had come the young men, Miss Donner, and Mrs. Whitney. Mrs. Whitney signalized her arrival by sitting down on a chest of dynamite—having intimidated the modest headquarters custodian by asking for a chair so imperiously that he was glad to walk away at her suggestion that he hunt one up—though there was not a chair within several miles. It had been no part of Glover's plan to receive his guests at that point, and his first efforts after the greetings were to coax them away from the interest they expressed in the equipment of an emergency headquarters, and get them back to where the track crossed the river. But when the young people learned that the blue-eyed boy at the little table on the rock could send a telegram or a cablegram for them to any part of the world, each insisted on putting a message through for the fun of the thing, and even Mrs. Whitney could hardly be coaxed from the illimitable possibilities just under her.

With a feeling of relief he got them away from the giant powder which Ed Smith's men were still bringing in, and across the river to the ledge that commanded the whole scene, and was safely removed from its activities.

Glover took ten minutes to point out to the president of the system the difficulties that would always confront the operating department in the cañon. He charted clearly for Mr. Brock the whole situation, with the hope that when certain very heavy estimates went before the directors one man at least would understand the necessity for them. Mr. Brock was a good questioner, and his interest turned constantly from the general observations offered by Glover to the work immediately in hand, which the engineer had no mind to exploit. The young people, however, were determined to see the blast, and it was only by strongly advising an early dinner and promising that they should have due notice of the blast that Glover got rid of his visitors at all.

He returned with them to the caboose in which they had come down, and when he got back to the work the big camp kettles were already slung along the bench, and the engine bringing the car of black powder was steaming slowing into the upper cañon. On a flat bowlder back of the cooks, Morris Blood, Ed Smith, and the roadmasters were sitting down to coffee and sandwiches, and Glover joined them. Men in relays were eating at the camp and dynamiters were picking their way across the face of the Cat's Paw with the giant powder. The engineers were still at their coffee-fire when the scream of a locomotive whistle came through the cañon from below. Blood looked up. "There's one of the fast mail engines, probably the 1026. Who in the world has brought her up?"

"More than likely," suggested Glover, finishing his coffee, "it's Bucks."