"I'll tell you a little later. Do you s'pose they would dig for coal?"

"Hardly that, either. There isn't the kind of land black diamonds grow in around here, that is, as far as I know."

"Or iron?"

"Scarcely iron," answered Professor Bailey, with a puzzled look at the boy. "But why do you ask me these questions? Are you thinking of turning miner instead of farmer?" with a smile.

"Perhaps," said Roger, and his serious air convinced the professor that the boy had some motive in his inquiries. "You see I can't tell you all about it just now, nor why I want to know this, Professor, but I will some day. I want, most of all, to find out what, if anything, of value could be in the Cardiff hills, that would make men, or a company of capitalists, want to get possession of certain land. It might be, I suppose, coal, or iron, or gold, or something else. The question is, what is it?"

"You are asking me to go ahead pretty much in the dark," objected Professor Bailey.

"I'm sorry, but I'm afraid those are all the clues I can give you now,"

said Roger.

"Well, I'll do my best to answer your puzzle," went on the teacher.

"From what I've read and know of the geological formation about here, I cannot think of any mineral or other deposit that would naturally be expected in this section. But of course it might be that, unknown to any one, except a certain person, there would be a valuable mine of something beneath the surface. Some mineral or quartz, but hardly coal, nor iron, nor gold."

"Perhaps it might be oil," suggested Roger.

"I'm afraid not," was the reply, "though, as I said, almost anything is possible, but in this instance, not very probable. If you were to show me a certain spot, I might be able to say, with more certainty than I can now, whether or not a particular mineral would be apt to be present."

"I can't take you to the place," said Roger, who was determined to guard his secret well, "because I want to keep this quiet as long as I can.

But, Professor, if I brought you a sample of rocks, or minerals, or--or--something--could you tell me then?"

"Possibly I could."

"Then I'll see if I can't get some samples for you. But, please don't tell any one I was in to see you about this. Not that there's anything wrong," quickly added Roger, "but," and he advanced closer, "this may mean a good deal to some people, and I don't want to raise hopes and have them disappointed."

"Very well," answered the Professor, a little puzzled about it all, but knowing, from Roger's frank and honest face that there could be nothing but what was right. "Very well. I'll keep quiet, you may depend on it.

And, when you bring me something more definite to work on, I'll help you all I can," and, with a hearty handshake, Professor Bailey showed Roger to the door.

"Now," said the boy to himself, as he walked slowly toward his uncle's house, "now to find out what they were digging for. I must get some of that stuff they brought up on the end of the drill. And I'll have to work quickly, for I think Mr. Ranquist suspects that I know."

CHAPTER XX

UNDERNEATH THE GROUND

For several days after the adventure with the bear Roger had no opportunity of going to the glade where the spring bubbled up, in order to find, if possible, what object the two engineers had in drilling there. Adrian was obliged to busy himself with various duties about the farm and garden, in order to get ready for the advanced spring planting, and Roger felt that he ought to help his cousin. But, all this time, Roger was busy thinking how he might accomplish his object, and get some of that mysterious substance which Mr. Dudley and Mr. Ranquist examined so eagerly.

He thought of a number of plans, but rejected them all as impracticable.

Most of them would have necessitated the bringing in of some one to help him, and this he did not want to do. Even when busiest at his tasks with Adrian, his mind was continually on this one subject, and, after a few days, it seemed it would be impossible for him, with his own unaided efforts, to dig down into the earth and find what was beneath the surface. But Roger was not a boy who gave a thing up because it was difficult.

One night, after a somewhat hard day in the garden, during which the boys had set out a lot of cabbage plants, and hoed the early beans, they were sitting in the parlor, Adrian showing Roger some books. One was a sea story, and there was a picture of a sailor heaving the log, in the old-fashioned way. Roger glanced at the reading matter, which told how, on board ship, the lead was sounded, and how the speed of the ship, as well as the depth of the water through which she was sailing, was ascertained.

The tale went on to relate how sometimes, the sailors used a piece of lead, with a hollow scooped in the lower end, into which s.p.a.ce they would place some tallow. Then they would throw the weighted line overboard, and when the lead struck bottom, some of the mud and sh.e.l.ls, of which the ocean bed is composed, would adhere to the grease in the hollow, scooped-out place. When the sinker was hauled to the surface and examined, experienced seamen could tell what sort of an anchorage they might find.

Roger started when he read this. He glanced over it again, carefully, and his heart beat suddenly, at the idea which came to him. His cheeks burned red with the happy thought, and he was almost afraid that Adrian would see his excitement, and question him. He made an excuse to go to his room, and busied himself there some time before he blew out his light and went to bed.

[Ill.u.s.tration: "His heart beat suddenly at the idea which came to him"]

He dreamed, that night, of climbing down into a deep, dark mine, which sparkled and glittered with the gold and diamonds lining the steep sides.

The next day Roger made a hasty breakfast. To his relief Adrian did not ask him to help with the farm work, nor did the country lad suggest, as he often did, a tramp through the woods; and Roger was very glad, for he had a plan to put in operation.

So, as soon as Adrian had left the house, having to go on an errand to a neighbor's, Roger stepped out of the back door, and made his way slowly to the path that led up through the vineyard, and, so on, to the spring glade. His pocket bulged with a number of objects, and, though he tried not to show it, he was considerably excited. It did not take him long to reach the spot where he had hidden himself from sight the day he watched Mr. Ranquist and Mr. Dudley drill down into the earth. He was almost afraid something might have happened to the place, but a careful look, showed him nothing had been disturbed.

There was the stone, behind which he first took his position, and the log, in the protecting shadow of which he had worked his way to a spot whence he might hear better. There was the second stone, and, after a little searching about he was able to discover the stick that the men had driven into the hole in the ground. He remembered pulling this up, after they had gone, and his disappointment at not finding anything there. Now he was resolved to be more careful in his method.

He looked warily about, to see that he was un.o.bserved, and then he slowly took up the small stake, so as not to disturb the dirt around the edges of the opening. In this he was successful, and, after a few seconds he was able to lift out the stick, and was rewarded by seeing a small circular shaft, about two inches in diameter, extending down into the unfathomable blackness. Now Roger was soon to know whether his plan would succeed.

From his pocket he drew a long, stout fishline, at one end of which was fastened a lead weight, slightly smaller around than the hole, and having a saucer-shaped depression in one end. He made sure that the sinker was tight on the string. From a small bottle he took a little rosin and beeswax, which he had decided to use instead of the tallow that served the sailors. He could get the wax more easily, and he thought that by stiffening it with rosin, it would answer just as well.

Now he was all ready to put his scheme into execution.

Lying down flat on his face, he carefully lowered the weight into the hole, keeping a strong hold of the string, so it would not pay out too fast. How anxiously did he watch the slender cord slipping down and down into the depths, the leaden messenger pulling it with a gentle force.

Farther and farther it went into the black hole. What would it come to rest on? Would it fulfil its mission, and get to the bottom of the opening? Or would the line be cut by sharp rocks? Once, when it had gone a quarter of the length of the string, the lead caught on some projection. How Roger's heart beat, fearing it would go no farther. He cautiously pulled the weight up a little and let it fall gently. This served to pa.s.s it beyond the stone that probably jutted out and stopped the progress momentarily. Then it kept on going down. The boy was straining every nerve in his eagerness to see what was down there, at the bottom of that little hole.

At length, after a few minutes, during which time the line had slid through his fingers, it suddenly slackened. Was this the end of the tiny shaft, or only another catch and temporary stopping on the downward journey? The boy pressed himself closer to the ground. He raised the string and from slackness it became taut with the heft of lead. Then Roger let it fall again, and it seemed to strike solid earth, or something. The cord no longer payed out. Once, twice, three times, he tried this, raising the weight and letting it fall suddenly, so that the wax and rosin in the saucer-shaped end might catch whatever there was at the bottom of the hole, and retain it.

Then Roger began to raise the lead to the surface. He worked slowly, and more cautiously than he had in lowering it, as, if the string caught on a projection now, it would be almost impossible to pull it up without tearing off the weight, and that would mean the failure of the whole plan. It was necessary to be careful, also, in order that whatever was imbedded in the wax might not be shaken off. Hand over hand he drew the cord up, and, with a fiercely beating heart, he saw the sinker come into view. He reached for it with trembling hands. Then, in the glow of the sunlight which streamed down on him, he turned the lead so that he might behold what the wax contained.

[Ill.u.s.tration: "Then Roger began to raise the lead to the surface"]

If he expected to see glittering specks of yellow gold, he was sorely disappointed. Nor was there anything he could think represented wealth, not even pieces of some mineral which would account for the great interest Mr. Dudley and Mr. Ranquist showed in their discovery.

With eyes that were a trifle dim from a sense that he had failed, Roger gazed at the waxed end of the weight. Imbedded in the sticky surface the boy saw some white crystals, which glinted and sparkled in the sun. Only some white crystals, that might have been chipped off a light-colored rock. To Roger they meant nothing. Almost idly he brushed them into the palm of his hand and rose to his feet. This, then, was the end of his hopes. The hole in the earth meant nothing, or else had been drilled for some object he could not discover. His golden dream of hidden wealth beneath his uncle's farm, by which the mortgage could be paid, was over now.

He turned away, and was about to throw the white crystals aside, when a sound behind caused him to start. He saw, emerging from the woods, Mr.

Ranquist. The engineer appeared much disturbed at the sight of the boy.

He stood still a moment, and then came forward rapidly. In his hand he carried a valise, which, as he dropped it on the ground, gave forth a metallic, clanking sound. Mr. Ranquist came close to Roger, who scarcely knew what to do.

"Well," began the man, and his voice was so strange that the boy felt vaguely alarmed, "well--" and he stopped.

"How do you do, Mr. Ranquist?" said the lad, as politely as he knew how.

"Humph! What right--I mean, what are you doing here? Spying on me? If you are, I warn you, boy, you'll be sorry for it. I have been suspicious of you, since the other day when you offered to lead us here. Now," and the engineer spoke sternly, "what do you mean?"

"Why, Mr. Ranquist--I--er--I--"

"No nonsense, now!"

For a moment Roger was somewhat frightened. Then his natural courage came back to him, and he felt a just resentment at the tone and manner of the man.

"Mr. Ranquist," he said. "I have as much right, and more, than you have, on this property. I--"