Two trips brought up the powder and instruments.

"We will take one of the kegs of powder down with us," said Harry, "and leave the other five in the empty room behind this. It is just as well not to have them in this room; the sparks fly about, and some things might catch fire. I don't think there is any real danger, but, at the same time, it is best to be on the safe side."

"There are a dozen pounds of candles in this bundle, senor. You did not tell me to get them, but I thought they might be useful."

"Thank you, Dias! they certainly will be useful. What are they?--tallow?"

"Yes, senor."

"Then before we go down we will get a couple of pieces of flat wood, and drive a peg into each, sharpened at the upper end. Candles stuck on these will stand upright, and we can put them down close to where we are working. They will give a better light than a torch, and leave us all free to use the tools. Did you think of buying some more tinder?"

"Yes, senor, I have five boxes, and half a dozen more flints."

They carried the keg of powder, the sledges, drills, and wedges downstairs, and then Dias and Jose set to work to sweep out the two chambers. The work was easy, but they were obliged to stop several times, being almost choked with the light dust. Harry and Bertie offered to take their turn, but the others would not hear of it, and they were glad to go up to what they called their drawing-room until the work was done and the dust had settled a little. Then they examined the pavement carefully with their torches. They had hoped that they might find either copper rings, or at least holes where rings had been fastened, but there were no signs whatever of such things in either of the chambers.

"We will begin to work half-way down," Harry said. "Of course the treasure may lie near the cistern end, but the depth below the floor would be very shallow there. More likely the chambers would be at the deep end. If we begin in the middle we may be pretty sure that we have not pa.s.sed them. We will begin rather nearer the pa.s.sage wall than the other, as the depth there will be greater. It does not matter which stone we take, one is as likely as another. Step ten paces from the cistern, Bertie, and the stone you stop on we will try first."

When Bertie came to a stand-still they carefully examined the pavement.

"You are standing on one of the cracks, Bertie; I will stay there while you all bring the tools along."

"Shall I open the powder?" Bertie asked.

"No. It is no good doing that until we have quite decided what we are going to do. The wedges certainly won't go into this crack. I think our best plan will be to sink a bore-hole about two inches from the crack.

We will drive it in in a slanting direction towards the edge, and in that way it will have more chance of blowing a piece out. First of all, we must make a slight indentation with a pick, otherwise we sha'n't get the bore to work. I will begin."

He took a pick and struck several blows.

"It is very hard stone," he said. "I have scarcely made a mark upon it."

He worked for some time, and then let Bertie take the pick. The lad struck a blow with all his strength, and then dropped the pick with a loud cry, wringing his hands as he did so.

"You have jarred your hands, Bertie; you should not hold the haft so tightly."

"It did sting!" Bertie said. "I feel as if I had taken hold of a red-hot poker. It has jarred my arm up to the shoulder; I can't go on at present."

"You try, Dias."

Dias went more carefully to work, knelt down on one knee, and proceeded to give a number of what seemed light blows.

"That is better than I did, Dias. The stone is crumbling into dust, and we shall be able to use the borer in a short time. Perhaps it will be better after all to drive the hole down straight. It will be easier to begin with; when we see how thick the stone is we shall know better how to proceed."

In ten minutes Dias had made a hole a quarter of an inch deep.

"Now, give me one of the borers--that one about two and a half feet long. I will hold it, and you strike to begin with, Dias, only mind my fingers. Keep your eye fixed on the top of the borer, and take one or two gentle strokes to begin with; then, when you know the distance you have to stand from it, do your best. You needn't really be afraid of striking my fingers. I shall hold the drill at least a foot from the top."

Dias began very carefully, gradually adding to the strength of the blows as he got the right distance, and was soon striking hard. After each blow Harry turned the borer a slight distance round. When he heard the native's breath coming fast he told Jose to take a turn. The lad was nervous; the first blow he struck only grazed the top of the borer, and narrowly missed Harry's fingers. Jose dropped the sledge. "I can't do it, senor; I am afraid of hitting your fingers. I will sit down and hold it; it does not matter if you hit me."

"It would matter a good deal, Jose. No, no; you have got to learn."

"Would it not be well, senor," Dias said, "to take the borers and three hammers outside, and try them in soft ground? We could work them there till we all got accustomed always to hit them fair. There would be no occasion for them to be held, and we should get confident. I could have hit twice as hard as I did, if I hadn't been afraid of missing it."

"I think that is a very good plan, Dias. The loss of a day or two will make no difference. We shall make up for it afterwards."

Accordingly the drills and hammers were all taken up, and they were soon at work. Two or three gentle taps were given to the borers, to make them stand upright, and then all four began work. At first they often either missed the heads of the borers or struck them unevenly.

"It is well, Dias, that we carried out your suggestion, as I see I should have had an uncommonly good chance of getting my fingers smashed, or a wrist broken. I have missed as often as any of you."

They stopped frequently for breath, and at the end of an hour were glad to lay down their hammers. Dias was comparatively fresh; his practice as a woodsman now did him good service.

"I should have thought from the number of trees that I have helped to cut down," Bertie said, "that I could hit pretty hard, but this is a great deal stiffer work. I should say that this hammer is at least twice the weight of the axe, and it is the lightest of the four. I ache a good deal worse than I did when I first chopped that tree down."

"So do I, Bertie. We will stick at this till we get accustomed to the work. By doing so we shall gain strength as well as skill."

"I will get some grease, senor, from Maria, and then I will rub your shoulders, and arms; that will do you a great deal of good."

"Thank you, Dias! It would be a good plan."

Dias did this to Jose as well as to the brothers, and then Jose in turn rubbed him.

They waited half an hour, and then Harry said: "Let us have another spell." This time a quarter of an hour sufficed. "It is of no use, Harry; I can't go on any longer," Bertie said. "I feel as if my shoulders were broken."

"I am beginning to feel the same, Bertie. However, we are all hitting straighter now. We will go up into the shade and take it quietly for two or three hours; then we will have a spell again."

However, after the rest, they all agreed that it would be useless to try again, for they could not lift their arms over their heads without feeling acute pain. Three days were spent at this exercise, and at the end of that time they had gained confidence, and the heads of the drills were no longer missed.

After the first day they only worked for a quarter of an hour at a time, taking an hour's rest. The pain in their arms had begun to abate.

On the following day they practised striking alternately, three standing round one borer. They found this at first awkward, but by the end of the day they were able to strike in regular order, the blows falling faster after each other on to the drill.

"I think we shall do now," said Bertie. "No doubt we shall hit harder with a fortnight's practice, and shall be able to keep it up longer.

However, I think that even now we have sufficient confidence in striking to be able to hold the borer without any fear of an accident."

The next day they began work early in the cellar. Jose volunteered to take the first turn to hold the drill.

"You understand, Jose, you must turn it round a little after each stroke, and in that way it will cut the hole regularly."

Harry took his place on one side of Jose, who sat with a leg on each side of the drill. Dias stood facing Harry, Bertie behind Jose holding the torch so that its light fell strongly on the head of the drill. At first the two men struck gently, but gradually, as they grew confident, increased the weight of their strokes until they were hitting with their full power. After ten minutes they stopped. "Let us look at the hole," Harry said. "How far has it got down?"

Jose moved his position and Harry examined the hole. "About an eighth of an inch," he said. "Let us sc.r.a.pe the dust out of it."

"Shall we take a spell now, Harry?" Bertie said.

"No, we will wait five minutes and then go on again, and after that we will change places with you, relieving each other every twenty minutes."

The work went on, and at the end of two hours the hole was three inches deep. Another hour and a half and the drill suddenly went down.

"We are through it," Bertie said, "and I am not sorry."

"Now I will lift the drill up gently, Bertie; do you kneel down, and when I stop, take hold of it close to the floor, so that we may see the thickness of the stone."