Bertie, who had joined Harry when he saw Dias approaching, had listened silently to their talk, then said:  
"Don't you think that, by loading the mules and moving towards the mouth of the next gorge just as it is getting dark, we might induce the Chincas to think that we are going that way, and so to follow along the top of the hills. We might, as soon as night has fallen, come back again and go down the stream. Of course there may be some of them left to watch the mouth of the ravine, but we could drive them off easily enough, and get a long start before the fellows on the hills know what has happened."
 
None of the others spoke immediately; then Harry said:
 
"The idea is a good one as far as it goes. But you see at present we are in a very strong position. If we leave this and they overtake us in the woods, we shall not have the advantages that we have here."
 
"Yes, I see that, Harry; but almost anything is better than having to wait here and lose our chance of finding that gold."
 
"We can't help that, Bertie. You know how much that gold would be to me, but, as I said this morning, I will run no desperate risks to obtain it. When I started upon this expedition I knew that the chances of success were extremely slight, and that there might be a certain amount of danger to encounter from wild beasts and perhaps brigands; but I had never calculated upon such a risk as this, and certainly I am not prepared to accept the responsibility of leading others into it."
 
There was again silence, which was broken at last by Dias.
 
"The proposal of the young se?or is a very bold one; but, as you say, Don Harry, after leaving our position we should be followed and surrounded. In the forest that would be very bad. I should say let us wait for at least a week; that will still give us time to reach the gold valley. By then the savages may have left, and some other plan may have occurred to us; at any rate, at the end of a week we shall see how things go. The Indians may have made an attack, and may lose heart after they are repulsed. They may find difficulty in procuring food, though I hardly think that is probable. Still, many things may occur in a week. If at the end of that time they are still here, we can decide whether to try some such plan as the young se?or has thought of, or whether to wait until the Indians leave, and then return to Cuzco; for I feel certain that the place cannot be found except by the help of the star."
 
"Well, then," Bertie said, "could we not hit upon some plan to frighten them?"
 
"What sort of plan, Bertie?"
 
"Well, of course we could not make a balloon—I mean a fire-balloon—because we have no paper to make it with. If we could, and could let it up at night, with some red and blue fires to go off when it got up high, I should think it would scare them horribly."
 
"Yes; but it would be still better, Bertie, if we could make a balloon big enough to carry us and the mules and everything else out of this place, and drop us somewhere about the spot we want to get to."
 
"Oh, it is all very well to laugh, Harry! I said, I knew we could not make a fire-balloon; I only gave that as an example. If we had powder enough we might make some rockets, and I should think that would scare them pretty badly."
 
"Yes, but we haven't got powder, Bertie. We have plenty of cartridges for sporting purposes, or for fighting; but a rocket is a thing that wants a lot of powder, besides saltpetre and charcoal, and so on."
 
"Yes, yes, I know that," Bertie said testily. "My suggestion was that we might frighten them somehow, and I still don't see why we shouldn't be able to do it. Let us try to hit upon something else."
 
"There is a good deal in what the young se?or says," Dias said gravely. "All the Indians are very superstitious, and think anything they don't understand is magic. It is worth thinking over: but before we do anything else we might find out how many of them there are at the other end of the ravine. Only a few may be left, or possibly the whole tribe may be gathered there at nightfall. To-night nothing will be settled, but to-morrow night I will go down the torrent with José. I will carry your double-barrelled guns with me, se?or, if you will let me have them. When we get to the other end I will take up my station there. José is small and active. He could crawl forward and ascertain how many of them there are. If he should be discovered, which is not likely, he would run back to me. I should have four barrels ready to pour into them. That would stop them, for they would think we were all there and were going to attack them, and before they could recover from their alarm we should be back here again."
 
"That seems a good plan, Dias; but I do not see why Bertie and I should not go down with you."
 
"It would be better not, se?or. In the first place, they may have men posted at their end of the ravine, and though two of us might crawl down without being seen, just as they crawled up here, they would be more likely to see four; in the next place, they might chance to crawl down the hillside above just as we were going down the ravine, and Maria and the animals would be at their mercy."
 
"They are hardly likely to choose the exact moment when we are to be away, but I quite agree with you that the risk must not be run."
 
"Well," Bertie said, returning to his former idea, "if Dias can go down there, I still think that somehow we might get up a scare."
 
Harry laughed.
 
"Well, you think it over, Bertie. If you can suggest anything, I promise you that Dias and I will do our best to carry it out."
 
"Very well," Bertie replied gravely, "I will think it over."
 
"Now," Harry said, "we had better sleep in watches at night; one must be at the breast-work, and one must listen for noises on the cliffs. It would be hardly possible for a number of men to crawl down without exciting suspicion or putting in motion some small stones."
 
"I do not think, se?or," Dias said, "that it will be necessary to keep that watch, for, as we knew from the noise when you fired last night, there are numbers of birds and at least one beast—I fancy it is a bear from the sound of its roar—up there, and it would be strange if a number of men making their way down did not disturb some of them; indeed, if one bird gave the alarm, it would put them all in motion; besides, there are certainly monkeys, for I heard their cries and chattering when the birds flew up. Still, it is perhaps as well that one of us should watch. Shall we divide, as we did last night? only, of course, José takes his place with you."
 
"I quite agree with you, Dias. Bertie, you had better get three hours' sleep at once, and then after dinner we will sit by the fire here, smoke, and listen, and Dias will watch the gorge and keep one ear open in this direction too. It is a comfort to know that if we cannot get away by going up the stream, the Indians cannot get down to attack us from that direction."
 
Two nights and days passed. The Indians were still on the hills, and once or twice men came down some distance, but a shot from Harry's rifle sent them speedily back again. The third night Bertie was on watch; he saw nothing, but suddenly there came three sharp taps. He discharged one barrel of his gun at random down the ravine, and then held himself ready to fire the other as soon as he saw anyone approaching. It was an anxious minute for him before the other three ran up.
 
"What is it, Bertie; have you seen anything?"
 
"No, but three arrows tapped against the wall, so I fired one barrel to call you up, and have been looking out for someone to take a shot at with the other; but I have not seen anyone, though, as you may imagine, I looked out sharply."
 
"It is probable that after the lesson they got the other night they did not come so near, and that they merely shot their arrows to see if we were still on guard. However, we may as well stay here for a bit to see if anything comes of it."
 
Nothing happened, however, and they returned to the tents. Next morning Bertie said to his brother:
 
"Look here, Harry, I have been thinking over that plan of mine. I really think there is something to be done with it."
 
"Well, tell us your plan."
 
"In the first place, how much powder can you spare?"
 
"There is that great powder-horn José drags about with him to charge his musket with. It will contain about a couple of pounds, I should say."
 
"That ought to do, I think."
 
"Well, what is your plan, Bertie?"
 
"In the first place, do you think that burned wood would do for charcoal?"
 
"It depends on what purpose you want it for."
 
"I want it to prevent the powder from going off with a bang."
 
"Oh, well, I should think that burned wood ground to a powder would be just as good as charcoal. So you are still thinking of rockets? Your two pounds of powder won't make many of them—not above two fair-sized ones, and the betting is they would not go up."
 
"No, I am not thinking of rockets, but of squibs and crackers. I know when I was at school I made a lot of these, and they worked very well. My idea is that if we could crawl up close to where the Indians are assembled, each carrying a dozen squibs and as many crackers, we could light a lot of the crackers first and chuck them among them, and then send the squibs whirling about over their heads, with a good bang at the end. It would set them off running, and they would never stop till they were back in their own forests."
 
"Well, I really do think that that is a fine idea—a splendid idea! The only drawback is, that in order to carry it out we should want a lot of strong cartridge-paper, and we have no paper except our note-books."
 
"I have thought of that, Harry, though it bothered me for a good long time. You see, the cases are only to hold the powder and to burn regularly as the powder does. At first I thought we might find some wood like elder and get the pith out, just as we used to do for pop-guns, but that unfortunately would not burn. We might, however, make them of linen."
 
"But we have no linen."
 
"No, but our leather bed-bags are lined with that coarse sort of stuff they cover mattresses with."
 
"Tick, you mean?"
 
"Yes, tick. Now, it struck me that this would do for the crackers. We should have to cut it in strips three or four times the width of the cracker. Then we could get Maria to make us some stiff paste; starch would be better, but of course we have none. Then, taking a strip of the cloth, we would turn over one side of it an inch from the edge to make a sort of trough, pour in the gunpowder, carefully paste all the rest of it and fold it over and over, and then, when it begins to dry, double it up and tie it with string. We should then only have to add touch-paper, which, of course, we could make out of anything, and put into the end fold. We could break up a few of the cartridges, soak them in wetted powder, and then cut them up into small pieces and stick them into the ends of the crackers. I think that would do first-rate. I have made dozens of crackers, and feel sure that I could turn out a good lot of them now. The squibs will be easier; we should only have to paste one side of the strips and roll them up so as to form suitable cases. When these are dry we should put a thimbleful of powder into each, and then fill them up with powder and charcoal. In order to make sure of a loud bang we could undo a piece of rope and wind the strands round each case for an inch and a half from the bottom. Of course, when we had ground down the burned wood we would mix it with powder and try one or two of the squibs, so as to find the proportions of charcoal to be used."
 
"You have evidently thought it all out well, and I think it does you no end of credit. I authorize you to begin the experiment at once. The first thing, of course, will be to get some wood and char it. I should think that you would require at least two pounds of that to two pounds of powder; but you had better only do a little at first—just enough to make an experiment. You know it will require ramming down well."
 
When Dias, who was on watch, returned he found Bertie at work burning pieces of wood and scraping off the charred surface. Harry explained the plan to him. As he had frequently seen fireworks at Lima, Dias quickly grasped the idea.
 
"It is splendid, se?or; those things will frighten them far more than guns. They will think so many devils have got among them, and we will heighten the effect by discharging every piece that we can among them. In their confusion they will think it is the fireworks that are killing them. That would be necessary, for otherwise when they recovered from the panic and found that no one had been hurt, they might summon up courage to return."
 
At noon the next day Bertie with assistance had four squibs and two crackers ready for trial. The squibs contained respectively one, two, three, and four parts of charcoal to one of powder.
 
"Don't hold them in your hand while you are trying the experiment, Bertie. Lay them down on that stone one by one and touch them off with a burning brand from the fire, and take care that you have a good long one."
 
All, with the exception of José who was on watch, gathered round. The first squib exploded with a bang, the second did the same, but with less violence, the third went off in an explosive spurt, the fourth burned as a squib should do, though a little fiercely, and gave a good bang at the end.
 
"They go off rather too rapidly, Bertie," Harry said; "we should want them to whiz about in a lively way as long as possible. I should put in five parts of that burned wood next time."
 
"I will try at once," Bertie said. "I have got lots of cases made, and enough burned stuff to make eight or ten more."
 
The mixture was soon made and another case charged, Bertie ramming down the mixture with a stick which he had cut to fit exactly, and a heavy stone as a hammer. This was done after each half-spoonful of the mixture was poured in. Then he inserted a strip of his touch-paper.
 
"I will take this in my hand," he said, "there is no fear of its exploding. I want to throw it into the air and see how it burns there."
 
The touch-paper was lit, and when the mixture started burning Bertie waved the squib high above his head and threw it into the air. It flew along some fifteen yards and then exploded.
 
"I don't think you can better that, Bertie. But you might make the cases a bit stronger; it burned out a little too quickly. We shall probably not be able to get very close to them."
 
The cracker was equally satisfactory, except that they agreed that a somewhat larger charge of powder should be used to increase the noise of the explosion.
 
"Now, Bertie," Harry said, "we will put all hands on to the business. Donna Maria shall make a good stock of paste, and cut the tick into strips for both widths. You shall make the cases for the squibs. Dias and I will take charge of the manufacture of charcoal. That will be a long job, for as you have two pounds of gunpowder we shall want ten of this charred wood."
 
"Not quite as much as that, Harry, because we shall want the powder alone for the crackers and the bangs of the squibs, and also for making the touch-paper for all of them."
 
"Well, we will say ten pounds, anyhow. We have a big stock of cartridges, and can spare a few of them for so good a purpose."
 
They were soon at work. By night the cases were all made and drying, and were left near the fire so as to be ready for filling in the morning.
 
Dias then said: "José will go down to-night, se?or. Of course I shall go with him. We must find out, in the first place, how near the mouth of the ravine the savages are gathered, whether they keep any watch, and what force they have. It will be well not to make ourselves known to them until at least the greater part are gathered there. If we were only to scare a small party, the others, when they came down, would know nothing of the panic, and might take up the pursuit."
 
"I wish we had some means of driving them off the top of the hill, Dias."
 
"I don't see how that can be done, se?or. But probably in another day or two they will all go down of their own accord. They must by this time have satisfied themselves that there is no getting at us from above, and that it would be too dangerous to attempt a descent here under the fire of our guns. They will be very likely, instead, to go down to-morrow or next day to hold a general council, and in that case they may decide either to risk climbing down at night, or to make a grand assault on the breast-work. Or, if they cannot bring themselves to that, they may decide to leave half a dozen men to watch the entrance, while the rest scatter themselves over the forests. In that case the watchers would only have to go off and summon them when we started again.............