"Well, as I was saying, the spot that I picked out looked so little like water, that the Burlington railroad people--it was the Burlington that had asked me about it--called in Spearon, who really was the expert on the work. He's an expert all right. He promptly approved the site I had chosen, and told them to go down and they would strike good water at 3,000 feet. At first they laughed at the idea of any man being able to guess at the existence of water, 3,000 feet distant through solid rock, but they knew that Survey statements usually are to be depended on and they began. Some water was struck in an upper layer, but Spearon told them to go on. A dozen times the railroad was about to give up the project as useless, but, being urged, at last they agreed to go down the 3,000 feet, but not an inch further. At 2,920 feet they struck the sandstone, and boring on to 2,980 feet they struck water, and so, within twenty feet of the exact depth advised, they got a well flowing half a million gallons daily under a pressure of 75 pounds." "A couple of hundred years ago, they would have burned you at the stake for a wizard," commented the boy. "They would, son, sure enough. But people never stop to think how important this very water is. Why, it is by far the most valuable mineral in the United States!" "More so than gold?" "A thousand times! More than coal, too, which is vastly more valuable than gold. The coal's going to give out some day--by the way, remind me to tell you what the Survey's done on the coal question some time. I'd tell you now, but there's a man who got on at the last stop that I want to see," and with a nod, Field rambled to the other end of the car. With stories and anecdotes of the Survey the time passed quickly, and Roger felt quite sorry the next day to find that they had arrived at their journey's end. At the depot, a small frame station, the rest of the members of the party awaited them, with a big lumbering farm wagon, but a pair of the finest horses Roger had ever seen. He won the heart of the teamster immediately by noticing them, and had the satisfaction of knowing that he had made a favorable impression on his future companions for the next few weeks by evincing a ready knowledge of the good points of a horse. The drive that afternoon through the upper Minnesota country was Roger's first experience of a corduroy road, that abomination of highways, which consists merely of logs laid down horizontally across a trail and some dirt and sand sifted on top of them. In course of time, the dirt all seeps through between the interstices of the logs, and the latter arrange themselves in positions more picturesque than comfortable; which, being ridden over in a springless wagon at a good fast clip, is a more energetic "bump the bumps" than any amusement park has thought of inflicting on a suffering public.