We found our molluscs and struggled back up the sloping path to shallow water. On the bank I lay and coughed, gasping and struggling to remove the residual water from my lungs and replace it with air. The transition back was far worse than entering the water. Nona, who quite evidently had done it several times before, recovered more quickly than I. As I lay panting and choking upon our couch, she made up a fire. The two stones which she rubbed together ignited in a moment—a slow, sulphurous-looking flame with a little smoke which the slight current of air through the cave carried away. Then, when the first stones were burning, she added other stones which glowed like coal. We ate our meal, and I lay again upon our couch with Nona sitting beside me. I was awakened by a sense of burning and smothering. I sat up, coughed, and twitched at Nona’s hair to arouse her. The cave was full of smoke. Beside me was what seemed a pit of fire. The heat from it was intolerable. I flung Nona into the air and followed her myself with a leap. Across the cave we stood trembling with fright, regarding the red monster of fire that had eaten for itself an open pit in the cave-floor. Nona had forgotten to extinguish the fire of our evening meal. These rocks were inflammable. The fire had eaten its way downward, as a fire on your Earth would eat downward into a bed of coal, spreading out beneath the ground. Nona and I did not reason it out that way at the time. All we knew was that the red fire-monster had broken loose, and we were afraid of it. Blue and red tongues of flame licked up from the mouth of its lair; its hot, poisonous breath was stifling us even across the cave. I was inactive only for a moment. Bidding Nona keep away, I tried to throw dirt into the little crater-mouth. But the dirt had no effect. I might have extinguished it with water you say? True, I might, though I think now that the volatile, highly aerated water would have been of little avail. I did not try the water. I did not know that water and fire were traditional enemies. Nor did Nona. How were we to know that, unless we had chanced to discover it for ourselves, which we had not. Nona screamed at me and I gave up my futile efforts. The air in the cave was almost suffocating; and with the instinct that comes to any trapped animal underground, we scrambled up the passageway to the surface of the meteor. * * * * * It was night, with silver Saturn filling the overhead sky. Trembling, we stood and watched the cave-mouth from which a visible line of smoke was now issuing. Our home was down there; the fire-monster had it—and we could not go down and take it from him. We never went back to the cave. The meteor’s swift days and nights passed in rapid succession; and during several of them we stood helplessly watching.