I did not think that Billy's prediction would come true, for they had certainly found no great stores of food on our island, and if it was food they were seeking they would surely suppose that, though we were alive, we had no more than supplied our own needs. However, there is no folly in being prepared for anything that may befall, so Billy and I set ourselves to think very seriously again of what we should do if our hut were besieged closely for any considerable length of time. Our situation would not be pleasant, between exasperated besiegers on the one side and the terrible monsters on the other, and I set my wits to work very earnestly to see if I might devise some means whereby we might extirpate those hideous creatures and so clear a way to the sea. To make an attack on them with our weapons held no great promise in it, for, as Billy said, they seemed to be terribly tough, and while we were disposing of one, others might cling around us and lug us to perdition. Besides, the very sight of the monsters made our blood run cold, and Billy said he would sooner face a thousand stepmothers than one of them, though he thought he might prefer one monster to three Hoggetts. [Sidenote: Experiments] It was after the matter had been beating in my head for several days that the notion came to me to try how the fizzy rock would affect the creatures. We knew what dreadful choking fumes came from it when it was thrown into water, and it seemed to me not impossible that these fumes might dissolve in water and poison it, and 'twould then be only a question of getting a sufficient quantity to destroy the whole nest or lair of the monsters. Considering that it would be a very laborious matter to bring down to the cliffs enough of the rock for our purpose, we determined to make a trial of it first, and the creature we selected for the _vile corpus_ (which is pretty nearly all the Latin I remember) was one of those robber crabs which I think I have mentioned. We caught one on the shore, and put him into one of my pots, which we filled with water and then cast in one or two lumps of the rock. There was a great fizzing and spluttering, with dense and suffocating fumes, and when they had cleared off and it was safe for us to go to the pot, we found the crab perfectly black and quite dead, and when Billy took it out of the pot he declared that the water stung his hand. We were very well satisfied with this trial, and immediately set about collecting a great quantity of the poisonous stuff, bringing it down from the mountain in baskets which we slung at our backs, and heaping it up on the cliff just above the entrance to the cave. I proposed that we should carry it down to the shore, and convey it to the monsters' haunt in our canoe, but this Billy would not hear of for a moment, avouching that he would sooner be eaten by savages than hugged by the slimy arms of the beasts. [Sidenote: Billy is Reflective]