We had failed to destroy the monsters from the cliff top, and I concluded that we must still fail, unless we could, find some means of attacking them in an enclosed space, where there was no current to carry away the water as soon as it was rendered poisonous. It was Billy who suggested the plan which we ultimately found successful. Though he had refused point blank to approach the cave in our canoe, he would not mind, he said, "having a go" at the monsters from the tunnel, for there at least we had dry land to run back to, whereas if the canoe were caught in the embrace of one of the large creatures there would be little chance for us. And since we had already learnt that the monsters came into the cave, as well as haunting the rocks outside, I agreed, when Billy suggested it, that even if we could not kill them outright we might make the water in the cave so exceeding noisome that they would depart thence and seek more savorous quarters. We saw great difficulties in the way, first, to the conveying a sufficiently great quantity of the rock to the cave; then the possibility of heavy rains falling before we had accomplished our task, with the consequent rise of the water in the lake and the flooding of the tunnel, which would not only render it a perilous place for us ourselves, but would use up, or decompose, as they say, the material we had collected before we got it to the proper place. As to the first difficulty, we were already so well accustomed to hard work of various kinds that we thought nothing of it; while for the matter of the rain we could only take our chance and resolve to be as philosophical as possible if all our labour was undone. With this in mind, we determined to collect the lumps of rock first of all in our hut, and not to begin to convey them through the tunnel until we had as much as we wanted: which accordingly we did, going backwards and forwards for many days between the hut and the spot on the mountain-side where we found an inexhaustible supply of the rock. When we had got together a sufficient quantity, we carried above two-thirds of it in baskets to the entrance of the cave, and very laborious it was, because the way was so rough and in places so narrow, and we barked our shins and elbows pretty often. But it was done at last, and then we laid up a similar heap on the cliff, at the same spot as we had put it before. [Illustration: Our Baskets] [Sidenote: End of the Monsters]