Accordingly, in the deep time of night Billy and I clambered out through the hole in the roof and set off with our spades up the mountain side, to dig out enough rock to make a big smoke as soon as it was light. Billy said it was a pity I had told the men about the rock, and he was sure harm would come of it; but I showed him that our case could scarcely be worse than it was, shut up in a narrow compass with such unpleasant companions, and that if we drove the savages from the island we should at least have liberty of movement, and as for what was to happen after, we must leave it to Providence, at the same time saying that the seamen would surely not remain long on the island when they found it was not very plentiful in food, so far as they could tell. "That's all very well, master," says Billy sorrowfully; "but there's enough to keep 'em until the fruits begin to ripen again, and there's all our pigs and fowls, which they'll eat up as sure as a gun, and we shan't be able to breed no more. Still, I don't see what we can do, unless we poison the whole lot of 'em, same as we did the monsters, and I suppose you won't agree to that." I said that I would not, and then reminded Billy that we had triumphed over many difficulties and dangers in our four years' residence on the island, and I did not in any way despair of coming safely through this present predicament; and so we went on up the mountain side, not hurrying or taking any particular care, for we knew the savages would not be in this part of the island, having a very wholesome dread of the volcano.
Being come to the place where the deposit of fizzy rock was, we worked a great quantity of it loose with our spades, and carried it to the neighbourhood of the springs, where by the dawn we had two great heaps. As soon as it began to be light we threw the rock bit by bit into the water, Billy at one spring and I at the other, being careful to keep out of sight from below, for we knew that every eye in the camps of the savages would be turned to the mountain as soon as they saw the smoke. It happened that the cloud of steam over the summit was somewhat denser than it had been the day before, which was all in favour of our design. We were favoured, too, by the stillness of the air, for, there being no wind, the fumes that rose from the rock hung about the mountain and did not float away, though that was also a disadvantage to us, inasmuch as we could not avoid the poisonous stench. We had to hold our breath and rush into the smoke in order to keep the springs constantly fed with the rock, and I began to feel very ill, and, going to see how Billy was faring, I observed that his skin was a greenish colour, and so I bade him to desist and to come with me and peer over to see whether our trick had wrought upon the savages as we hoped it would. We saw that they were standing in a great throng watching the smoke; but they did not as yet appear to be infected with panic, which, when I thought of it, I considered to be due to the absence of the rumbling noises that commonly accompanied the action of the volcano. Since we could not in any way make such a noise as would counterfeit the natural rumbling, I racked my brains to think of any other means by which we might work upon them the beginnings of fright, for I was sure that if we could only start them it would not be long before panic fear got hold of them, and then it would sweep them away. Running back to my spring, to cast more rock into it, I observed that there were some big boulders a little higher up, below the edge of the crater, that appeared to be insecurely poised. They were at the top of a gentle slope, which fell away afterwards into a sheer precipice several hundreds of feet in depth. I wondered whether the boulders I have mentioned could be seen from the savages' camp, and creeping up the slope to see, I found that the savages were quite out of sight; whereupon I hastened down to Billy, and after throwing into the springs enough rock to last a good while, we went together to the top of the slope, and shoving with all our strength against one of the boulders, we set it rolling down. The moment we had started it we went to another, and so on, until there was a sort of cascade of rocks sliding down the slope and then plunging over the edge and crashing down at the foot of the precipice, the sound coming very faintly to our ears.