"That's right," approved McCarty. "It's the only proper way to learn. Here's another thing to think of: Suppose you went on to that machine to-morrow as a runner. You know now how it works, all about the levers, etc. But, take one example. The first thing you may have to do is to move back on another section of track. A section of track is only fifteen feet long, and the part of the car that rests on it covers twelve of the fifteen feet. The section next is butted up against the one the car is on, but is not fastened to it. Across the ends of the two sections the ground men place two six-foot pieces of iron rail, to catch the center wheels of the car. Now, everything is ready for moving, and the ground men signal, 'Go ahead.' You start ahead. Suddenly the ground men, who are watching cry, 'Hold, hold.' When you have heard that cry you know the car is not hitting that second section right. You have to stop that machine, and stop it, not in a second, but in a fraction of a second, or your machine will be off the track and buried in the sand; or, perhaps, even skidded into the ditch, and likely lost to you forever. Do you suppose a green man, with all that array of levers before him, could act quick enough to save his machine and crew? Why, running a steam locomotive is easy compared to running one of these things. Well, I guess we have gone over everything, and we might as well go back to camp. In the morning we will come out and fire up and take a few lessons in actual practice in firing and handling some of the simpler levers." "Good!" Walter exclaimed. "Say, what's that haze off there in the west? Isn't it smoke?" "Indian fires," said McCarty. "They burn off parts of the prairies every six months so as to get fresh pasture for their stock. Appearances are deceptive out here. The air is so clear that one can see objects very far distant. Now, how far off would you say that fire is?" "About ten miles off," Walter guessed. "It's more than twice that far," declared the other. "It's a queer country we will be entering soon, and I'm thinking we'll see some queer things before we get through this job. But, here we are at the camp. My, that supper smells good." They found the Captain driving the negroes at their task with all the authority an old shipmaster can display. "Gee," exclaimed McCarty, "I never saw those niggers work like that before. Why, they've got all the empty tents down and one of them washed up. I wonder how he did it." "Oh, the Captain can handle men, all right," said Walter proudly. "That has been his business all his life, handling tough crews of sailors." The old skipper knocked off his men for the night and joined the two lads. "Well, I've got a good start for to-morrow," he said, with satisfaction. "We'll have everything finished up by to-morrow night. Say, those Saws ain't half-bad workers when you handle them right."